> ## Documentation Index
> Fetch the complete documentation index at: https://devdocs.xbox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# System API reference

> System API reference for the Microsoft Game Development Kit (GDK), covering DirectStorage, XAccessibility, Touch Adaptation Kit, and other system APIs.

# System API reference

System API reference material for the Microsoft Game Development Kit (GDK).

## In this section

[DStorage](/reference/system/dstorage/dstorage_members)\
XBOX DirectStorage APIs.

[Touch Adaptation Kit](/reference/system/touchadaptationkit/touchadaptationkit-reference)\
Schema reference for Touch Adaptation Kit layouts

[XAccessibility](/reference/system/xaccessibility/xaccessibility_members)\
Reference material for GameAccessibility APIs.

[XAppCapture](/reference/system/xappcapture/xappcapture_members)\
Reference material for XAppCapture APIs.

[XAsync](/reference/system/xasync/xasync_members)\
Reference material for XAsync APIs.

[XAsyncProvider](/reference/system/xasyncprovider/xasyncprovider_members)\
Reference material for XAsyncProvider APIs.

[XDisplay](/reference/system/xdisplay/xdisplay_members)\
Reference material for XDisplay APIs.

[XError](/reference/system/xerror/xerror_members)\
Reference material for XError APIs.

[XGame](/reference/system/xgame/xgame_members)\
XGame

[XGameEvent](/reference/system/xgameevent/xgameevent_members)\
APIs for writing in-game events.

[XGameInvite](/reference/system/xgameinvite/xgameinvite_members)\
Reference material for XGameInvite APIs.

[XGameProtocol](/reference/system/xgameprotocol/xgameprotocol_members)\
APIs for dealing with protocol activation.

[XGameRuntimeFeature](/reference/system/xgameruntimefeature/xgameruntimefeature_members)\
Reference material for XGameRuntimeFeature APIs.

[XGameRuntimeInit](/reference/system/xgameruntimeinit/xgameruntimeinit_members)\
Reference material for XGameRuntimeInit APIs.

[XGameRuntimeTypes](/reference/system/xgameruntimetypes/xgameruntimetypes_members)\
Reference material for XGameRuntimeTypes APIs.

[XGameSave Wrapper](/reference/system/Wrappers/xgamesave_wrapper_members)\
XGameSave Wrapper Reference

[XGameSave](/reference/system/xgamesave/xgamesave_members)\
Reference material for XGameSave APIs.

[XGameSaveFiles](/reference/system/xgamesavefiles/xgamesavefiles_members)\
Reference material for XGameSaveFiles APIs.

[XGameStreaming](/reference/system/xgamestreaming/xgamestreaming_members)\
Game streaming APIs.

[XGameUI](/reference/system/xgameui/xgameui_members)\
Reference material for XGameUI APIs.

[XLauncher](/reference/system/xlauncher/xlauncher_members)\
XLauncher APIs

[XMem (NDA topic)](/reference/system/xmem/xmem_members)\
Reference material for memory APIs.

[XPackage](/reference/system/xpackage/xpackage_members)\
Reference material for XPackage APIs.

[XPersistentLocalStorage](/reference/system/xpersistentlocalstorage/xpersistentlocalstorage_members)\
Reference material for the XPersistentLocalStorage APIs.

[XSpeechSynthesizer](/reference/system/xspeechsynthesizer/xspeechsynthesizer_members)\
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](/reference/system/xstore/xstore_members)\
Reference material for XStore APIs.

[XSystem](/reference/system/xsystem/xsystem_members)\
Reference material for XSystem APIs.

[XTaskQueue](/reference/system/xtaskqueue/xtaskqueue_members)\
XTaskQueue APIs

[XThread](/reference/system/xthread/xthread_members)\
Reference material for XThread APIs.

[XUser](/reference/system/xuser/xuser_members)\
Reference material for XUser APIs.


## Related topics

- [XSystem](/reference/system/xsystem/xsystem_members.md)
- [GDK Commerce Systems Overview](/publishing/xstore-commerce/xstore-overview.md)
- [API reference](/reference/gc-reference-toc.md)
- [XSystemAnalyticsInfo](/reference/system/xsystem/structs/xsystemanalyticsinfo.md)
- [XSystemDeviceType](/reference/system/xsystem/enums/xsystemdevicetype.md)