diff --git a/Aerofoil/Aerofoil.vcxproj b/Aerofoil/Aerofoil.vcxproj
index 3b3db1c..00cb81e 100644
--- a/Aerofoil/Aerofoil.vcxproj
+++ b/Aerofoil/Aerofoil.vcxproj
@@ -177,6 +177,7 @@
     <ClInclude Include="..\GpCommon\IGpAudioChannelCallbacks.h" />
     <ClInclude Include="..\GpCommon\IGpDisplayDriverSurface.h" />
     <ClInclude Include="..\GpCommon\IGpLogDriver.h" />
+    <ClInclude Include="..\GpCommon\IGpPrefsHandler.h" />
     <ClInclude Include="GpAppEnvironment.h" />
     <ClInclude Include="GpAudioDriverFactory.h" />
     <ClInclude Include="GpDisplayDriverFactory.h" />
diff --git a/Aerofoil/Aerofoil.vcxproj.filters b/Aerofoil/Aerofoil.vcxproj.filters
index 3f6d759..eda19b8 100644
--- a/Aerofoil/Aerofoil.vcxproj.filters
+++ b/Aerofoil/Aerofoil.vcxproj.filters
@@ -150,6 +150,9 @@
     <ClInclude Include="GpLogDriver_Win32.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="..\GpCommon\IGpPrefsHandler.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <Image Include="ConvertedResources\Large128.ico">
diff --git a/Aerofoil/GpAppEnvironment.cpp b/Aerofoil/GpAppEnvironment.cpp
index bde43d5..a8ce647 100644
--- a/Aerofoil/GpAppEnvironment.cpp
+++ b/Aerofoil/GpAppEnvironment.cpp
@@ -142,6 +142,7 @@ void GpAppEnvironment::InitializeApplicationState()
 {
 	GpAppInterface_Get()->PL_HostDisplayDriver_SetInstance(m_displayDriver);
 	GpAppInterface_Get()->PL_HostAudioDriver_SetInstance(m_audioDriver);
+	GpAppInterface_Get()->PL_HostInputDriver_SetInstances(m_inputDrivers, m_numInputDrivers);
 	GpAppInterface_Get()->PL_InstallHostSuspendHook(GpAppEnvironment::StaticSuspendHookFunc, this);
 
 	GpAppInterface_Get()->PL_HostFontHandler_SetInstance(m_fontHandler);
diff --git a/GpApp/Externs.h b/GpApp/Externs.h
index f4783f5..79d4ca3 100644
--- a/GpApp/Externs.h
+++ b/GpApp/Externs.h
@@ -96,7 +96,6 @@ typedef struct
 	long		wasGPFlipMap;
 	long		wasGPFaceLeftMap, wasGPFaceRightMap;
 	short		wasVolume;
-	short		prefVersion;
 	short		wasMaxFiles;
 	short		wasEditH, wasEditV;
 	short		wasMapH, wasMapV;
@@ -175,8 +174,10 @@ Boolean CheckFileError (short, const PLPasStr &);				// --- File Error.c
 
 THandle<void> LoadHouseResource(const PortabilityLayer::ResTypeID &resTypeID, int16_t resID);	// --- HouseIO.c
 
-Boolean SavePrefs (prefsInfo *, short);					// --- Prefs.c
-Boolean LoadPrefs (prefsInfo *, short);
+Boolean SavePrefs (prefsInfo *, THandle<void> *modulePrefs, short);					// --- Prefs.c
+Boolean LoadPrefs (prefsInfo *, THandle<void> *modulePrefs, short);
+Boolean SaveModulePrefs (THandle<void> currentModulePrefs, THandle<void> *outModulePrefs);
+Boolean ApplyModulePrefs (THandle<void> *modulePrefs);
 
 void PasStringCopy (StringPtr, StringPtr);				// --- StringUtils.c
 short WhichStringFirst (StringPtr, StringPtr);
diff --git a/GpApp/GpAppInterface.cpp b/GpApp/GpAppInterface.cpp
index e1369e5..45345b1 100644
--- a/GpApp/GpAppInterface.cpp
+++ b/GpApp/GpAppInterface.cpp
@@ -7,6 +7,7 @@
 #include "HostDisplayDriver.h"
 #include "HostLogDriver.h"
 #include "HostSystemServices.h"
+#include "HostInputDriver.h"
 #include "HostVOSEventQueue.h"
 #include "MenuManager.h"
 #include "WindowManager.h"
@@ -21,6 +22,7 @@ public:
 	void PL_Render(IGpDisplayDriver *displayDriver) override;
 	void PL_HostFileSystem_SetInstance(PortabilityLayer::HostFileSystem *instance) override;
 	void PL_HostDisplayDriver_SetInstance(IGpDisplayDriver *instance) override;
+	void PL_HostInputDriver_SetInstances(IGpInputDriver *const* instances, size_t numInstances) override;
 	void PL_HostSystemServices_SetInstance(PortabilityLayer::HostSystemServices *instance) override;
 	void PL_HostAudioDriver_SetInstance(IGpAudioDriver *instance) override;
 	void PL_HostLogDriver_SetInstance(IGpLogDriver *instance) override;
@@ -72,6 +74,11 @@ void GpAppInterfaceImpl::PL_HostAudioDriver_SetInstance(IGpAudioDriver *instance
 	PortabilityLayer::HostAudioDriver::SetInstance(instance);
 }
 
+void GpAppInterfaceImpl::PL_HostInputDriver_SetInstances(IGpInputDriver *const* instances, size_t numInstances)
+{
+	PortabilityLayer::HostInputDriver::SetInstances(instances, numInstances);
+}
+
 void GpAppInterfaceImpl::PL_HostFontHandler_SetInstance(PortabilityLayer::HostFontHandler *instance)
 {
 	PortabilityLayer::HostFontHandler::SetInstance(instance);
diff --git a/GpApp/Main.cpp b/GpApp/Main.cpp
index 352d722..d573f8a 100644
--- a/GpApp/Main.cpp
+++ b/GpApp/Main.cpp
@@ -15,7 +15,7 @@
 #include "WindowManager.h"
 
 
-#define kPrefsVersion			0x0036
+#define kPrefsVersion			0x0037
 
 
 void ReadInPrefs (void);
@@ -45,6 +45,8 @@ extern Boolean		isMapOpen, isToolsOpen, isCoordOpen;
 extern Boolean		doPrettyMap, doBitchDialogs;
 //extern Boolean		didValidation;
 
+THandle<void>		globalModulePrefs;
+
 //==============================================================  Functions
 //--------------------------------------------------------------  ReadInPrefs
 
@@ -55,8 +57,10 @@ extern Boolean		doPrettyMap, doBitchDialogs;
 void ReadInPrefs (void)
 {
 	prefsInfo	thePrefs;
+
+	THandle<void> modulePrefs;
 	
-	if (LoadPrefs(&thePrefs, kPrefsVersion))
+	if (LoadPrefs(&thePrefs, &modulePrefs, kPrefsVersion))
 	{
 #ifdef COMPILEDEMO
 		PasStringCopy("\pDemo House", thisHouseName);
@@ -126,6 +130,13 @@ void ReadInPrefs (void)
 		doBackground = thePrefs.wasDoBackground;
 		doPrettyMap = thePrefs.wasPrettyMap;
 		doBitchDialogs = thePrefs.wasBitchDialogs;
+
+		if (modulePrefs)
+			ApplyModulePrefs(&modulePrefs);
+
+		globalModulePrefs.Dispose();
+		globalModulePrefs = modulePrefs;
+		modulePrefs = nullptr;
 	}
 	else
 	{
@@ -201,6 +212,8 @@ void ReadInPrefs (void)
 		doBackground = false;
 		doPrettyMap = false;
 		doBitchDialogs = true;
+
+		modulePrefs.Dispose();
 	}
 	
 	if ((numNeighbors > 1) && (thisMac.constrainedScreen.right <= 512))
@@ -293,9 +306,13 @@ void WriteOutPrefs (void)
 	thePrefs.wasDoBackground = doBackground;
 	thePrefs.wasPrettyMap = doPrettyMap;
 	thePrefs.wasBitchDialogs = doBitchDialogs;
-	
-	if (!SavePrefs(&thePrefs, kPrefsVersion))
+
+	THandle<void> modulePrefs;
+
+	if (!SaveModulePrefs(globalModulePrefs, &modulePrefs) || !SavePrefs(&thePrefs, &modulePrefs, kPrefsVersion))
 		SysBeep(1);
+
+	modulePrefs.Dispose();
 	
 	UnivSetSoundVolume(wasVolume, thisMac.hasSM3);
 }
@@ -325,6 +342,9 @@ int gpAppMain()
 	SetUpAppleEvents();
 	LoadCursors();
 	ReadInPrefs();
+
+	SpinCursor(2);	// Tick once to let the display driver flush any resolution changes from prefs
+	FlushResolutionChange();
 	
 #if defined COMPILEDEMO
 	copyGood = true;
@@ -339,7 +359,7 @@ int gpAppMain()
 	else if (didValidation)
 		WriteOutPrefs();				SpinCursor(3);
 #endif
-	
+
 //	if ((thisMac.numScreens > 1) && (isUseSecondScreen))
 //		ReflectSecondMonitorEnvirons(false, true, true);
 	HandleDepthSwitching();
diff --git a/GpApp/Prefs.cpp b/GpApp/Prefs.cpp
index 2f63671..f8b0222 100644
--- a/GpApp/Prefs.cpp
+++ b/GpApp/Prefs.cpp
@@ -10,25 +10,42 @@
 #include "Externs.h"
 #include "Environ.h"
 #include "FileManager.h"
+#include "IGpAudioDriver.h"
+#include "IGpDisplayDriver.h"
+#include "IGpInputDriver.h"
+#include "IGpPrefsHandler.h"
 #include "IOStream.h"
+#include "MemoryManager.h"
+#include "HostAudioDriver.h"
+#include "HostDisplayDriver.h"
+#include "HostInputDriver.h"
 
 
 #define	kPrefCreatorType	'ozm5'
 #define	kPrefFileType		'gliP'
-#define	kPrefFileName		PSTR("Glider Prefs")
+#define	kPrefFileName		PSTR("Glider Prefs v2")
 #define	kDefaultPrefFName	PSTR("Preferences")
 #define kPrefsStringsID		160
 #define kNewPrefsAlertID	160
 #define	kPrefsFNameIndex	1
 
+typedef struct modulePrefsListEntry
+{
+	THandle<char> m_identifier;
+	THandle<uint8_t> m_contents;
+	uint32_t m_version;
+} modulePrefsListEntry;
 
 Boolean CanUseFindFolder (void);
-Boolean WritePrefs (const prefsInfo *);
-PLError_t ReadPrefs (prefsInfo *);
+Boolean WritePrefs (const prefsInfo *, short versionNow, THandle<modulePrefsListEntry> *theModulePrefs);
+PLError_t ReadPrefs (prefsInfo *thePrefs, short versionNeed, Boolean *isOldVersion, THandle<modulePrefsListEntry> *theModulePrefs);
 Boolean DeletePrefs ();
 void BringUpDeletePrefsAlert (void);
 
 
+THandle<modulePrefsListEntry> theModulePrefs;
+
+
 //==============================================================  Functions
 //--------------------------------------------------------------  CanUseFindFolder
 
@@ -39,7 +56,7 @@ Boolean CanUseFindFolder (void)
 
 //--------------------------------------------------------------  WritePrefs
 
-Boolean WritePrefs (const prefsInfo *thePrefs)
+Boolean WritePrefs (const prefsInfo *thePrefs, short versionNow, THandle<modulePrefsListEntry> modulePrefs)
 {
 	PLError_t		theErr;
 	PortabilityLayer::IOStream *fileStream;
@@ -66,15 +83,70 @@ Boolean WritePrefs (const prefsInfo *thePrefs)
 		CheckFileError(theErr, PSTR("Preferences"));
 		return(false);
 	}
-	
+
+	uint32_t version = versionNow;
+	if (fileStream->Write(&version, sizeof(version)) != sizeof(version))
+	{
+		CheckFileError(PLErrors::kIOError, PSTR("Preferences"));
+		fileStream->Close();
+		return(false);
+	}
+
 	byteCount = sizeof(*thePrefs);
 
 	if (fileStream->Write(thePrefs, byteCount) != byteCount)
 	{
 		CheckFileError(PLErrors::kIOError, PSTR("Preferences"));
+		fileStream->Close();
 		return(false);
 	}
 
+	uint32_t numEntries = 0;
+	if (modulePrefs)
+		numEntries = modulePrefs.MMBlock()->m_size / sizeof(modulePrefsListEntry);
+
+	if (fileStream->Write(&numEntries, sizeof(numEntries)) != sizeof(numEntries))
+	{
+		CheckFileError(PLErrors::kIOError, PSTR("Preferences"));
+		fileStream->Close();
+		return(false);
+	}
+
+	for (uint32_t i = 0; i < numEntries; i++)
+	{
+		modulePrefsListEntry *entry = (*modulePrefs) + i;
+
+		uint32_t version = entry->m_version;
+
+		if (fileStream->Write(&version, sizeof(version)) != sizeof(version))
+		{
+			CheckFileError(PLErrors::kIOError, PSTR("Preferences"));
+			fileStream->Close();
+			return(false);
+		}
+
+		THandle<void> handles[2] = { entry->m_identifier.StaticCast<void>(), entry->m_contents.StaticCast<void>() };
+
+		for (int hi = 0; hi < 2; hi++)
+		{
+			uint32_t hSize = handles[hi].MMBlock()->m_size;
+
+			if (fileStream->Write(&hSize, sizeof(hSize)) != sizeof(hSize))
+			{
+				CheckFileError(PLErrors::kIOError, PSTR("Preferences"));
+				fileStream->Close();
+				return(false);
+			}
+
+			if (fileStream->Write(*handles[hi], hSize) != hSize)
+			{
+				CheckFileError(PLErrors::kIOError, PSTR("Preferences"));
+				fileStream->Close();
+				return(false);
+			}
+		}
+	}
+
 	fileStream->Close();
 	
 	return(true);
@@ -82,19 +154,39 @@ Boolean WritePrefs (const prefsInfo *thePrefs)
 
 //--------------------------------------------------------------  SavePrefs
 
-Boolean SavePrefs (prefsInfo *thePrefs, short versionNow)
+Boolean SavePrefs (prefsInfo *thePrefs, THandle<void> *modulePrefs, short versionNow)
 {
-	thePrefs->prefVersion = versionNow;
-	
-	if (!WritePrefs(thePrefs))
+	if (!WritePrefs(thePrefs, versionNow, modulePrefs->StaticCast<modulePrefsListEntry>()))
 		return(false);
 	
 	return(true);
 }
 
+static void DestroyModulePrefs(THandle<modulePrefsListEntry> *theModulePrefs)
+{
+	if (!*theModulePrefs)
+		return;
+
+	modulePrefsListEntry *firstOldEntry = **theModulePrefs;
+
+	if (!firstOldEntry)
+		return;
+
+	size_t numOldPrefs = theModulePrefs->MMBlock()->m_size / sizeof(modulePrefsListEntry);
+
+	for (size_t i = 0; i < numOldPrefs; i++)
+	{
+		firstOldEntry[i].m_contents.Dispose();
+		firstOldEntry[i].m_identifier.Dispose();
+		firstOldEntry[i].~modulePrefsListEntry();
+	}
+
+	theModulePrefs->Dispose();
+}
+
 //--------------------------------------------------------------  ReadPrefs
 
-PLError_t ReadPrefs (prefsInfo *thePrefs)
+PLError_t ReadPrefs (prefsInfo *thePrefs, short versionNeed, Boolean *isOldVersion, THandle<modulePrefsListEntry> *theModulePrefs)
 {
 	PLError_t		theErr;
 	PortabilityLayer::IOStream		*fileStream;
@@ -102,6 +194,8 @@ PLError_t ReadPrefs (prefsInfo *thePrefs)
 	VFileSpec	theSpecs;
 	Str255		fileName;
 
+	*isOldVersion = false;
+
 	PortabilityLayer::FileManager *fm = PortabilityLayer::FileManager::GetInstance();
 	
 	PasStringCopy(kPrefFileName, fileName);
@@ -117,6 +211,21 @@ PLError_t ReadPrefs (prefsInfo *thePrefs)
 		CheckFileError(theErr, PSTR("Preferences"));
 		return(theErr);
 	}
+
+	uint32_t version = 0;
+	if (fileStream->Read(&version, sizeof(version)) != sizeof(version))
+	{
+		CheckFileError(theErr, PSTR("Preferences"));
+		fileStream->Close();
+		return(PLErrors::kIOError);
+	}
+
+	if (version != versionNeed)
+	{
+		*isOldVersion = true;
+		fileStream->Close();
+		return(PLErrors::kNone);
+	}
 	
 	byteCount = sizeof(*thePrefs);
 
@@ -124,7 +233,81 @@ PLError_t ReadPrefs (prefsInfo *thePrefs)
 	{
 		CheckFileError(PLErrors::kIOError, PSTR("Preferences"));
 		fileStream->Close();
-		return(theErr);
+		return(PLErrors::kIOError);
+	}
+
+	uint32_t numModulePrefs = 0;
+	if (fileStream->Read(&numModulePrefs, sizeof(numModulePrefs)) != sizeof(numModulePrefs))
+	{
+		CheckFileError(PLErrors::kIOError, PSTR("Preferences"));
+		fileStream->Close();
+		return(PLErrors::kIOError);
+	}
+
+	DestroyModulePrefs(theModulePrefs);
+
+	if (numModulePrefs)
+	{
+		PortabilityLayer::MemoryManager *mm = PortabilityLayer::MemoryManager::GetInstance();
+
+		*theModulePrefs = THandle<modulePrefsListEntry>(mm->AllocHandle(numModulePrefs * sizeof(modulePrefsListEntry)));
+
+		if (!*theModulePrefs)
+		{
+			CheckFileError(PLErrors::kIOError, PSTR("Preferences"));
+			fileStream->Close();
+			return(PLErrors::kIOError);
+		}
+
+		modulePrefsListEntry *firstNewEntry = **theModulePrefs;
+
+		for (size_t i = 0; i < numModulePrefs; i++)
+			new (firstNewEntry + i) modulePrefsListEntry();
+
+		for (uint32_t i = 0; i < numModulePrefs; i++)
+		{
+			if (fileStream->Read(&firstNewEntry[i].m_version, sizeof(firstNewEntry[i].m_version)) != sizeof(firstNewEntry[i].m_version))
+			{
+				DestroyModulePrefs(theModulePrefs);
+				CheckFileError(PLErrors::kIOError, PSTR("Preferences"));
+				fileStream->Close();
+				return(PLErrors::kIOError);
+			}
+
+			for (int subHandle = 0; subHandle < 2; subHandle++)
+			{
+				uint32_t handleSz;
+				if (fileStream->Read(&handleSz, sizeof(handleSz)) != sizeof(handleSz))
+				{
+					DestroyModulePrefs(theModulePrefs);
+					CheckFileError(PLErrors::kIOError, PSTR("Preferences"));
+					fileStream->Close();
+					return(PLErrors::kIOError);
+				}
+
+				PortabilityLayer::MMHandleBlock *mmBlock = mm->AllocHandle(handleSz);
+				if (!mmBlock)
+				{
+					DestroyModulePrefs(theModulePrefs);
+					CheckFileError(PLErrors::kIOError, PSTR("Preferences"));
+					fileStream->Close();
+					return(PLErrors::kIOError);
+				}
+
+				if (subHandle == 0)
+					firstNewEntry[i].m_identifier = THandle<char>(mmBlock);
+				else
+					firstNewEntry[i].m_contents = THandle<uint8_t>(mmBlock);
+
+				if (fileStream->Read(mmBlock->m_contents, handleSz) != handleSz)
+				{
+					DestroyModulePrefs(theModulePrefs);
+					CheckFileError(PLErrors::kIOError, PSTR("Preferences"));
+					fileStream->Close();
+					return(PLErrors::kIOError);
+				}
+			}
+		}
 	}
 	
 	fileStream->Close();
@@ -147,14 +330,42 @@ Boolean DeletePrefs ()
 	return PortabilityLayer::FileManager::GetInstance()->DeleteFile(theSpecs.m_dir, theSpecs.m_name);
 }
 
+//--------------------------------------------------------------  RunFunctionOnAllPrefsHandlers
+bool RunFunctionOnAllPrefsHandlers (void *context, bool (*func) (void *context, IGpPrefsHandler *handler))
+{
+	IGpPrefsHandler *ddHandler = PortabilityLayer::HostDisplayDriver::GetInstance()->GetPrefsHandler();
+	if (ddHandler && !func(context, ddHandler))
+		return false;
+
+	IGpPrefsHandler *adHandler = PortabilityLayer::HostAudioDriver::GetInstance()->GetPrefsHandler();
+	if (adHandler && !func(context, adHandler))
+		return false;
+
+	size_t numInputDrivers = PortabilityLayer::HostInputDriver::NumInstances();
+
+	for (size_t i = 0; i < numInputDrivers; i++)
+	{
+		IGpPrefsHandler *idHandler = PortabilityLayer::HostInputDriver::GetInstance(i)->GetPrefsHandler();
+		if (idHandler && !func(context, idHandler))
+			return false;
+	}
+
+	return true;
+}
+
+
+
 //--------------------------------------------------------------  LoadPrefs
 
-Boolean LoadPrefs (prefsInfo *thePrefs, short versionNeed)
+Boolean LoadPrefs (prefsInfo *thePrefs, THandle<void> *modulePrefs, short versionNeed)
 {
 	PLError_t		theErr;
 	Boolean		noProblems;
+	Boolean		isOldVersion = 0;
+
+	THandle<modulePrefsListEntry> mPrefs;
 	
-	theErr = ReadPrefs(thePrefs);
+	theErr = ReadPrefs(thePrefs, versionNeed, &isOldVersion, &mPrefs);
 
 	if (theErr == PLErrors::kFileNotFound)
 		return (false);
@@ -165,19 +376,164 @@ Boolean LoadPrefs (prefsInfo *thePrefs, short versionNeed)
 		noProblems = DeletePrefs();
 		return (false);
 	}
-	
-	if (thePrefs->prefVersion != versionNeed)
+
+	if (isOldVersion)
 	{
 		BringUpDeletePrefsAlert();
 		noProblems = DeletePrefs();
 		return(false);
 	}
 	
+	*modulePrefs = mPrefs.StaticCast<void>();
+
 	return (true);
 }
 
 //--------------------------------------------------------------  BringUpDeletePrefsAlert
 
+static THandle<void> CloneHandle(THandle<void> hdl)
+{
+	if (!hdl)
+		return THandle<void>();
+
+	PortabilityLayer::MMHandleBlock *newHdl = PortabilityLayer::MemoryManager::GetInstance()->AllocHandle(hdl.MMBlock()->m_size);
+	if (!newHdl)
+		return THandle<void>();
+
+	memcpy(newHdl->m_contents, hdl.MMBlock()->m_contents, hdl.MMBlock()->m_size);
+
+	return THandle<void>(newHdl);
+}
+
+struct SaveModulePrefsContext
+{
+	size_t m_numModulePrefs;
+	THandle<modulePrefsListEntry> m_newPrefs;
+};
+
+bool SaveModulePrefsWriteFunc(void *vcontext, const void *identifier, size_t identifierSize, const void *contents, size_t contentsSize, uint32_t version)
+{
+	PortabilityLayer::MemoryManager *mm = PortabilityLayer::MemoryManager::GetInstance();
+
+	SaveModulePrefsContext *context = static_cast<SaveModulePrefsContext*>(vcontext);
+	modulePrefsListEntry *saveToEntry = nullptr;
+
+	for (size_t i = 0; i < context->m_numModulePrefs; i++)
+	{
+		modulePrefsListEntry *checkEntry = (*context->m_newPrefs) + i;
+		THandle<char> candidateIdentHdl = checkEntry->m_identifier;
+		size_t candidateIdentSize = candidateIdentHdl.MMBlock()->m_size;
+
+		if (candidateIdentSize == identifierSize && !memcmp(*candidateIdentHdl, identifier, candidateIdentSize))
+		{
+			saveToEntry = checkEntry;
+			break;
+		}
+	}
+
+	if (!saveToEntry)
+	{
+		if (context->m_numModulePrefs == 0)
+			context->m_newPrefs = THandle<modulePrefsListEntry>(mm->AllocHandle(sizeof(modulePrefsListEntry)));
+		else
+			mm->ResizeHandle(context->m_newPrefs.MMBlock(), (context->m_numModulePrefs + 1) * sizeof(modulePrefsListEntry));
+
+		saveToEntry = (*context->m_newPrefs) + context->m_numModulePrefs;
+		new (saveToEntry) modulePrefsListEntry();
+
+		context->m_numModulePrefs++;
+	}
+
+	if (saveToEntry->m_contents)
+		saveToEntry->m_contents.Dispose();
+
+	if (!saveToEntry->m_identifier)
+	{
+		saveToEntry->m_identifier = THandle<char>(mm->AllocHandle(identifierSize));
+		memcpy(*saveToEntry->m_identifier, identifier, identifierSize);
+	}
+
+	saveToEntry->m_contents = THandle<uint8_t>(mm->AllocHandle(contentsSize));
+	memcpy(*saveToEntry->m_contents, contents, contentsSize);
+
+	saveToEntry->m_version = version;
+
+	return true;
+}
+
+bool SaveModulePrefsCallback(void *vcontext, IGpPrefsHandler *handler)
+{
+	return handler->SavePrefs(vcontext, SaveModulePrefsWriteFunc);
+}
+
+Boolean SaveModulePrefs(THandle<void> currentModulePrefs, THandle<void> *outModulePrefs)
+{
+	SaveModulePrefsContext context;
+
+	size_t numModulePrefs = 0;
+	THandle<modulePrefsListEntry> newPrefs;
+
+	if (currentModulePrefs)
+	{
+		numModulePrefs = currentModulePrefs.MMBlock()->m_size / sizeof(modulePrefsListEntry);
+		newPrefs = CloneHandle(currentModulePrefs).StaticCast<modulePrefsListEntry>();
+
+		modulePrefsListEntry *entries = *newPrefs;
+		for (size_t i = 0; i < numModulePrefs; i++)
+		{
+			entries[i].m_contents = CloneHandle(entries[i].m_contents.StaticCast<void>()).StaticCast<uint8_t>();
+			entries[i].m_identifier = CloneHandle(entries[i].m_identifier.StaticCast<void>()).StaticCast<char>();
+		}
+	}
+	else
+		newPrefs = THandle<modulePrefsListEntry>(PortabilityLayer::MemoryManager::GetInstance()->AllocHandle(0));
+
+	context.m_newPrefs = newPrefs;
+	context.m_numModulePrefs = numModulePrefs;
+
+	bool savedOK = RunFunctionOnAllPrefsHandlers(&context, SaveModulePrefsCallback);
+
+	if (savedOK)
+	{
+		outModulePrefs->Dispose();
+		*outModulePrefs = context.m_newPrefs.StaticCast<void>();
+	}
+
+	return savedOK;
+}
+
+//--------------------------------------------------------------  BringUpDeletePrefsAlert
+
+struct ApplyModulePrefsContext
+{
+	size_t m_numModulePrefs;
+	THandle<modulePrefsListEntry> m_newPrefs;
+};
+
+bool ApplyModulePrefsCallback(void *vcontext, IGpPrefsHandler *handler)
+{
+	ApplyModulePrefsContext *context = static_cast<ApplyModulePrefsContext*>(vcontext);
+
+	const modulePrefsListEntry *entries = *(context->m_newPrefs);
+
+	for (size_t i = 0; i < context->m_numModulePrefs; i++)
+		handler->ApplyPrefs(*entries[i].m_identifier, entries[i].m_identifier.MMBlock()->m_size, *entries[i].m_contents, entries[i].m_contents.MMBlock()->m_size, entries[i].m_version);
+
+	return true;
+}
+
+Boolean ApplyModulePrefs (THandle<void> *modulePrefs)
+{
+	ApplyModulePrefsContext context;
+
+	context.m_newPrefs = modulePrefs->StaticCast<modulePrefsListEntry>();
+	context.m_numModulePrefs = context.m_newPrefs.MMBlock()->m_size / sizeof(modulePrefsListEntry);
+
+	return RunFunctionOnAllPrefsHandlers(&context, ApplyModulePrefsCallback);
+}
+
+//--------------------------------------------------------------  BringUpDeletePrefsAlert
+
 void BringUpDeletePrefsAlert (void)
 {
 	short		whoCares;
diff --git a/GpAudioDriver_XAudio2/GpAudioDriverXAudio2.cpp b/GpAudioDriver_XAudio2/GpAudioDriverXAudio2.cpp
index 5fabe56..dfdb0ef 100644
--- a/GpAudioDriver_XAudio2/GpAudioDriverXAudio2.cpp
+++ b/GpAudioDriver_XAudio2/GpAudioDriverXAudio2.cpp
@@ -10,6 +10,11 @@ void GpAudioDriverXAudio2::Shutdown()
 	delete this;
 }
 
+IGpPrefsHandler *GpAudioDriverXAudio2::GetPrefsHandler() const
+{
+	return nullptr;
+}
+
 const GpAudioDriverProperties &GpAudioDriverXAudio2::GetProperties() const
 {
 	return m_properties;
diff --git a/GpAudioDriver_XAudio2/GpAudioDriverXAudio2.h b/GpAudioDriver_XAudio2/GpAudioDriverXAudio2.h
index e931ed1..4a9c070 100644
--- a/GpAudioDriver_XAudio2/GpAudioDriverXAudio2.h
+++ b/GpAudioDriver_XAudio2/GpAudioDriverXAudio2.h
@@ -14,6 +14,8 @@ public:
 	void SetMasterVolume(uint32_t vol, uint32_t maxVolume) override;
 	void Shutdown() override;
 
+	IGpPrefsHandler *GetPrefsHandler() const override;
+
 	const GpAudioDriverProperties &GetProperties() const;
 	IXAudio2 *GetXA2() const;
 	IXAudio2MasteringVoice *GetMasteringVoice() const;
diff --git a/GpCommon/IGpAudioDriver.h b/GpCommon/IGpAudioDriver.h
index f3b16cb..9f77acb 100644
--- a/GpCommon/IGpAudioDriver.h
+++ b/GpCommon/IGpAudioDriver.h
@@ -3,6 +3,7 @@
 #include <stdint.h>
 
 struct IGpAudioChannel;
+struct IGpPrefsHandler;
 
 struct IGpAudioDriver
 {
@@ -12,4 +13,6 @@ public:
 	virtual void SetMasterVolume(uint32_t vol, uint32_t maxVolume) = 0;
 
 	virtual void Shutdown() = 0;
+
+	virtual IGpPrefsHandler *GetPrefsHandler() const = 0;
 };
diff --git a/GpCommon/IGpDisplayDriver.h b/GpCommon/IGpDisplayDriver.h
index 12348f9..e5439d2 100644
--- a/GpCommon/IGpDisplayDriver.h
+++ b/GpCommon/IGpDisplayDriver.h
@@ -5,6 +5,7 @@
 
 struct IGpDisplayDriverSurface;
 struct IGpCursor;
+struct IGpPrefsHandler;
 struct GpDisplayDriverProperties;
 
 struct GpDisplayDriverSurfaceEffects
@@ -45,6 +46,7 @@ public:
 	virtual void RequestResetVirtualResolution() = 0;
 
 	virtual const GpDisplayDriverProperties &GetProperties() const = 0;
+	virtual IGpPrefsHandler *GetPrefsHandler() const = 0;
 };
 
 inline GpDisplayDriverSurfaceEffects::GpDisplayDriverSurfaceEffects()
diff --git a/GpCommon/IGpInputDriver.h b/GpCommon/IGpInputDriver.h
index 6480331..cadd333 100644
--- a/GpCommon/IGpInputDriver.h
+++ b/GpCommon/IGpInputDriver.h
@@ -1,7 +1,11 @@
 #pragma once
 
+struct IGpPrefsHandler;
+
 struct IGpInputDriver
 {
 	virtual void ProcessInput() = 0;
 	virtual void Shutdown() = 0;
+
+	virtual IGpPrefsHandler *GetPrefsHandler() const = 0;
 };
diff --git a/GpCommon/IGpPrefsHandler.h b/GpCommon/IGpPrefsHandler.h
new file mode 100644
index 0000000..4bb065b
--- /dev/null
+++ b/GpCommon/IGpPrefsHandler.h
@@ -0,0 +1,11 @@
+#pragma once
+
+#include <stdint.h>
+
+struct IGpPrefsHandler
+{
+	typedef bool (*WritePrefsFunc_t) (void *context, const void *identifier, size_t identifierSize, const void *contents, size_t contentsSize, uint32_t version);
+
+	virtual void ApplyPrefs(const void *identifier, size_t identifierSize, const void *contents, size_t contentsSize, uint32_t version) = 0;
+	virtual bool SavePrefs(void *context, WritePrefsFunc_t writeFunc) = 0;
+};
diff --git a/GpDisplayDriver_D3D11/GpDisplayDriverD3D11.cpp b/GpDisplayDriver_D3D11/GpDisplayDriverD3D11.cpp
index 9933b53..1647510 100644
--- a/GpDisplayDriver_D3D11/GpDisplayDriverD3D11.cpp
+++ b/GpDisplayDriver_D3D11/GpDisplayDriverD3D11.cpp
@@ -21,6 +21,14 @@
 
 static GpDisplayDriverSurfaceEffects gs_defaultEffects;
 
+static const char *kPrefsIdentifier = "GpDisplayDriverD3D11";
+static uint32_t kPrefsVersion = 1;
+
+struct GpDisplayDriverD3D11_Prefs
+{
+	bool m_isFullScreen;
+};
+
 namespace GpBinarizedShaders
 {
 	extern const unsigned char *g_drawQuadV_D3D11[2];
@@ -1449,6 +1457,29 @@ const GpDisplayDriverProperties &GpDisplayDriverD3D11::GetProperties() const
 	return m_properties;
 }
 
+IGpPrefsHandler *GpDisplayDriverD3D11::GetPrefsHandler() const
+{
+	const IGpPrefsHandler *cPrefsHandler = this;
+	return const_cast<IGpPrefsHandler*>(cPrefsHandler);
+}
+
+void GpDisplayDriverD3D11::ApplyPrefs(const void *identifier, size_t identifierSize, const void *contents, size_t contentsSize, uint32_t version)
+{
+	if (version == kPrefsVersion && identifierSize == strlen(kPrefsIdentifier) && !memcmp(identifier, kPrefsIdentifier, identifierSize))
+	{
+		const GpDisplayDriverD3D11_Prefs *prefs = static_cast<const GpDisplayDriverD3D11_Prefs *>(contents);
+		m_isFullScreenDesired = prefs->m_isFullScreen;
+	}
+}
+
+bool GpDisplayDriverD3D11::SavePrefs(void *context, IGpPrefsHandler::WritePrefsFunc_t writeFunc)
+{
+	GpDisplayDriverD3D11_Prefs prefs;
+	prefs.m_isFullScreen = m_isFullScreenDesired;
+
+	return writeFunc(context, kPrefsIdentifier, strlen(kPrefsIdentifier), &prefs, sizeof(prefs), kPrefsVersion);
+}
+
 GpDisplayDriverD3D11 *GpDisplayDriverD3D11::Create(const GpDisplayDriverProperties &properties)
 {
 	void *storage = malloc(sizeof(GpDisplayDriverD3D11));
diff --git a/GpDisplayDriver_D3D11/GpDisplayDriverD3D11.h b/GpDisplayDriver_D3D11/GpDisplayDriverD3D11.h
index 201ead5..61ec143 100644
--- a/GpDisplayDriver_D3D11/GpDisplayDriverD3D11.h
+++ b/GpDisplayDriver_D3D11/GpDisplayDriverD3D11.h
@@ -4,12 +4,15 @@
 #include "GpRingBuffer.h"
 
 #include "IGpDisplayDriver.h"
+#include "IGpPrefsHandler.h"
 #include "GpCoreDefs.h"
 #include "GpDisplayDriverProperties.h"
 #include "GpComPtr.h"
 
 #include "GpPixelFormat.h"
 
+#include "IGpPrefsHandler.h"
+
 struct GpWindowsGlobals;
 struct IGpCursor_Win32;
 struct IGpCursor;
@@ -30,7 +33,7 @@ struct ID3D11Texture2D;
 struct ID3D11VertexShader;
 
 
-class GpDisplayDriverD3D11 : public IGpDisplayDriver
+class GpDisplayDriverD3D11 : public IGpDisplayDriver, public IGpPrefsHandler
 {
 public:
 	void Run() override;
@@ -54,6 +57,10 @@ public:
 	void RequestResetVirtualResolution() override;
 
 	const GpDisplayDriverProperties &GetProperties() const override;
+	IGpPrefsHandler *GetPrefsHandler() const override;
+
+	void ApplyPrefs(const void *identifier, size_t identifierSize, const void *contents, size_t contentsSize, uint32_t version) override;
+	bool SavePrefs(void *context, IGpPrefsHandler::WritePrefsFunc_t writeFunc) override;
 
 	static GpDisplayDriverD3D11 *Create(const GpDisplayDriverProperties &properties);
 
diff --git a/GpInputDriver_XInput/GpInputDriverXInput.cpp b/GpInputDriver_XInput/GpInputDriverXInput.cpp
index 0f4d8ef..7796bc4 100644
--- a/GpInputDriver_XInput/GpInputDriverXInput.cpp
+++ b/GpInputDriver_XInput/GpInputDriverXInput.cpp
@@ -76,6 +76,11 @@ void GpInputDriverXInput::Shutdown()
 	free(this);
 }
 
+IGpPrefsHandler *GpInputDriverXInput::GetPrefsHandler() const
+{
+	return nullptr;
+}
+
 GpInputDriverXInput *GpInputDriverXInput::Create(const GpInputDriverProperties &props)
 {
 	void *storage = malloc(sizeof(GpInputDriverXInput));
diff --git a/GpInputDriver_XInput/GpInputDriverXInput.h b/GpInputDriver_XInput/GpInputDriverXInput.h
index c0981cd..971c504 100644
--- a/GpInputDriver_XInput/GpInputDriverXInput.h
+++ b/GpInputDriver_XInput/GpInputDriverXInput.h
@@ -13,6 +13,8 @@ public:
 	void ProcessInput() override;
 	void Shutdown() override;
 
+	IGpPrefsHandler *GetPrefsHandler() const override;
+
 	static GpInputDriverXInput *Create(const GpInputDriverProperties &props);
 
 private:
diff --git a/PortabilityLayer/GpAppInterface.h b/PortabilityLayer/GpAppInterface.h
index 347742e..1b0b518 100644
--- a/PortabilityLayer/GpAppInterface.h
+++ b/PortabilityLayer/GpAppInterface.h
@@ -21,6 +21,7 @@
 
 struct IGpAudioDriver;
 struct IGpLogDriver;
+struct IGpInputDriver;
 
 namespace PortabilityLayer
 {
@@ -43,6 +44,7 @@ public:
 	virtual void PL_HostFileSystem_SetInstance(PortabilityLayer::HostFileSystem *instance) = 0;
 	virtual void PL_HostDisplayDriver_SetInstance(IGpDisplayDriver *instance) = 0;
 	virtual void PL_HostLogDriver_SetInstance(IGpLogDriver *instance) = 0;
+	virtual void PL_HostInputDriver_SetInstances(IGpInputDriver *const* instances, size_t numInstances) = 0;
 	virtual void PL_HostSystemServices_SetInstance(PortabilityLayer::HostSystemServices *instance) = 0;
 	virtual void PL_HostFontHandler_SetInstance(PortabilityLayer::HostFontHandler *instance) = 0;
 	virtual void PL_HostVOSEventQueue_SetInstance(PortabilityLayer::HostVOSEventQueue *instance) = 0;
diff --git a/PortabilityLayer/HostInputDriver.cpp b/PortabilityLayer/HostInputDriver.cpp
new file mode 100644
index 0000000..8d59621
--- /dev/null
+++ b/PortabilityLayer/HostInputDriver.cpp
@@ -0,0 +1,23 @@
+#include "HostInputDriver.h"
+
+namespace PortabilityLayer
+{
+	size_t HostInputDriver::NumInstances()
+	{
+		return ms_numInstances;
+	}
+
+	IGpInputDriver *HostInputDriver::GetInstance(size_t index)
+	{
+		return ms_instances[index];
+	}
+
+	void HostInputDriver::SetInstances(IGpInputDriver *const* instances, size_t numInstances)
+	{
+		ms_instances = instances;
+		ms_numInstances = numInstances;
+	}
+
+	IGpInputDriver *const* HostInputDriver::ms_instances;
+	size_t HostInputDriver::ms_numInstances;
+}
diff --git a/PortabilityLayer/HostInputDriver.h b/PortabilityLayer/HostInputDriver.h
index 8f5379d..8593c1e 100644
--- a/PortabilityLayer/HostInputDriver.h
+++ b/PortabilityLayer/HostInputDriver.h
@@ -1,17 +1,18 @@
 #pragma once
 
-#include "HostKeyID.h"
+struct IGpInputDriver;
 
 namespace PortabilityLayer
 {
 	class HostInputDriver
 	{
 	public:
-
-		static HostInputDriver *GetInstance();
-		static void SetInstance(HostInputDriver *instance);
+		static size_t NumInstances();
+		static IGpInputDriver *GetInstance(size_t index);
+		static void SetInstances(IGpInputDriver *const* instances, size_t numInstances);
 
 	private:
-		static HostInputDriver *ms_instance;
+		static IGpInputDriver *const* ms_instances;
+		static size_t ms_numInstances;
 	};
 }
diff --git a/PortabilityLayer/PLApplication.cpp b/PortabilityLayer/PLApplication.cpp
index 65504d2..7c2352f 100644
--- a/PortabilityLayer/PLApplication.cpp
+++ b/PortabilityLayer/PLApplication.cpp
@@ -1,24 +1,24 @@
-#include "PLApplication.h"
+#include "PLApplication.h"
 #include "PLCore.h"
-#include "HostSystemServices.h"
-
-#include <string.h>
-#include <assert.h>
-
-namespace PortabilityLayer
-{
-	namespace Utils
-	{
-		void MakePStr(unsigned char *dest, size_t sz, const char *src)
-		{
-			assert(sz <= 255);
-			dest[0] = static_cast<uint8_t>(sz);
-			memcpy(dest + 1, src, sz);
-		}
-	}
-}
-
-void SysBeep(int duration)
+#include "HostSystemServices.h"
+
+#include <string.h>
+#include <assert.h>
+
+namespace PortabilityLayer
 {
-	PortabilityLayer::HostSystemServices::GetInstance()->Beep();
-}
+	namespace Utils
+	{
+		void MakePStr(unsigned char *dest, size_t sz, const char *src)
+		{
+			assert(sz <= 255);
+			dest[0] = static_cast<uint8_t>(sz);
+			memcpy(dest + 1, src, sz);
+		}
+	}
+}
+
+void SysBeep(int duration)
+{
+	PortabilityLayer::HostSystemServices::GetInstance()->Beep();
+}
diff --git a/PortabilityLayer/PortabilityLayer.vcxproj b/PortabilityLayer/PortabilityLayer.vcxproj
index 32cc412..fcc1386 100644
--- a/PortabilityLayer/PortabilityLayer.vcxproj
+++ b/PortabilityLayer/PortabilityLayer.vcxproj
@@ -312,6 +312,7 @@
     <ClCompile Include="HostDisplayDriver.cpp" />
     <ClCompile Include="HostFileSystem.cpp" />
     <ClCompile Include="HostFontHandler.cpp" />
+    <ClCompile Include="HostInputDriver.cpp" />
     <ClCompile Include="HostLogDriver.cpp" />
     <ClCompile Include="HostSuspendHook.cpp" />
     <ClCompile Include="HostSystemServices.cpp" />
diff --git a/PortabilityLayer/PortabilityLayer.vcxproj.filters b/PortabilityLayer/PortabilityLayer.vcxproj.filters
index d715b21..ee488c6 100644
--- a/PortabilityLayer/PortabilityLayer.vcxproj.filters
+++ b/PortabilityLayer/PortabilityLayer.vcxproj.filters
@@ -728,5 +728,8 @@
     <ClCompile Include="HostLogDriver.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="HostInputDriver.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
 </Project>
\ No newline at end of file