> ## Documentation Index > Fetch the complete documentation index at: https://docs.xbox.com/llms.txt > Use this file to discover all available pages before exploring further. # System API reference material for the Microsoft Game Development Kit (GDK) > System API reference for the Microsoft Game Development Kit (GDK), covering DirectStorage, XAccessibility, Touch Adaptation Kit, and other system APIs. System API reference material for the Microsoft Game Development Kit (GDK). ## In this section [DStorage](https://docs.xbox.com/reference/system/dstorage/dstorage_members.md)\ XBOX DirectStorage APIs. [Touch Adaptation Kit](https://docs.xbox.com/reference/system/touchadaptationkit/touchadaptationkit-reference.md)\ Schema reference for Touch Adaptation Kit layouts [XAccessibility](https://docs.xbox.com/reference/system/xaccessibility/xaccessibility_members.md)\ Reference material for GameAccessibility APIs. [XAppCapture](https://docs.xbox.com/reference/system/xappcapture/xappcapture_members.md)\ Reference material for XAppCapture APIs. [XAsync](https://docs.xbox.com/reference/system/xasync/xasync_members.md)\ Reference material for XAsync APIs. [XAsyncProvider](https://docs.xbox.com/reference/system/xasyncprovider/xasyncprovider_members.md)\ Reference material for XAsyncProvider APIs. [XDisplay](https://docs.xbox.com/reference/system/xdisplay/xdisplay_members.md)\ Reference material for XDisplay APIs. [XError](https://docs.xbox.com/reference/system/xerror/xerror_members.md)\ Reference material for XError APIs. [XGame](https://docs.xbox.com/reference/system/xgame/xgame_members.md)\ XGame [XGameEvent](https://docs.xbox.com/reference/system/xgameevent/xgameevent_members.md)\ APIs for writing in-game events. [XGameInvite](https://docs.xbox.com/reference/system/xgameinvite/xgameinvite_members.md)\ Reference material for XGameInvite APIs. [XGameProtocol](https://docs.xbox.com/reference/system/xgameprotocol/xgameprotocol_members.md)\ APIs for dealing with protocol activation. [XGameRuntimeFeature](https://docs.xbox.com/reference/system/xgameruntimefeature/xgameruntimefeature_members.md)\ Reference material for XGameRuntimeFeature APIs. [XGameRuntimeInit](https://docs.xbox.com/reference/system/xgameruntimeinit/xgameruntimeinit_members.md)\ Reference material for XGameRuntimeInit APIs. [XGameRuntimeTypes](https://docs.xbox.com/reference/system/xgameruntimetypes/xgameruntimetypes_members.md)\ Reference material for XGameRuntimeTypes APIs. [XGameSave Wrapper](https://docs.xbox.com/reference/system/Wrappers/xgamesave_wrapper_members.md)\ XGameSave Wrapper Reference [XGameSave](https://docs.xbox.com/reference/system/xgamesave/xgamesave_members.md)\ Reference material for XGameSave APIs. [XGameSaveFiles](https://docs.xbox.com/reference/system/xgamesavefiles/xgamesavefiles_members.md)\ Reference material for XGameSaveFiles APIs. [XGameStreaming](https://docs.xbox.com/reference/system/xgamestreaming/xgamestreaming_members.md)\ Game streaming APIs. [XGameUI](https://docs.xbox.com/reference/system/xgameui/xgameui_members.md)\ Reference material for XGameUI APIs. [XLauncher](https://docs.xbox.com/reference/system/xlauncher/xlauncher_members.md)\ XLauncher APIs [XMem (NDA topic)](https://docs.xbox.com/reference/system/xmem/xmem_members.md)\ Reference material for memory APIs. [XPackage](https://docs.xbox.com/reference/system/xpackage/xpackage_members.md)\ Reference material for XPackage APIs. [XPersistentLocalStorage](https://docs.xbox.com/reference/system/xpersistentlocalstorage/xpersistentlocalstorage_members.md)\ Reference material for the XPersistentLocalStorage APIs. [XSpeechSynthesizer](https://docs.xbox.com/reference/system/xspeechsynthesizer/xspeechsynthesizer_members.md)\ Provides support for initializing and configuring a speech synthesis engine (voice) for converting a text string into an audio stream. This functionality is also known as text-to-speech (TTS). [XStore](https://docs.xbox.com/reference/system/xstore/xstore_members.md)\ Reference material for XStore APIs. [XSystem](https://docs.xbox.com/reference/system/xsystem/xsystem_members.md)\ Reference material for XSystem APIs. [XTaskQueue](https://docs.xbox.com/reference/system/xtaskqueue/xtaskqueue_members.md)\ XTaskQueue APIs [XThread](https://docs.xbox.com/reference/system/xthread/xthread_members.md)\ Reference material for XThread APIs. [XUser](https://docs.xbox.com/reference/system/xuser/xuser_members.md)\ Reference material for XUser APIs. ## Related topics - [API reference (contents)](https://docs.xbox.com/reference/gc-reference-toc.md) - [Access Microsoft Game Development Kit (GDK) development resources](https://docs.xbox.com/home/onboarding-access/access-resources.md) - [Run Microsoft Game Development Kit (GDK) API task](https://docs.xbox.com/build/core-features/common/async/async-libraries/async-library-xasync-example-run-gdk-task.md) - [Using Clang with the Microsoft Game Development Kit (GDK)](https://docs.xbox.com/tools/tools-pc/visualstudio/gr-vs-clang.md) - [Using Clang with the Microsoft Game Development Kit (GDK) for consoles](https://docs.xbox.com/tools/tools-console/visualstudio/vs-clang.md)