> ## 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.

# Multiplayer Session Directory (MPSD) concepts

> Index of Multiplayer Session Directory (MPSD) concepts including session templates, visibility, joinability, large sessions, and troubleshooting guides.

This section describes the concepts of the Multiplayer Session Directory (MPSD) service.

## In this section

[Multiplayer Session advanced topics](/services/xbox-services/multiplayer/mpsd/concepts/live-mpsd-details)
Provides details about multiplayer sessions.

[Game session visibility and joinability](/services/xbox-services/multiplayer/mpsd/concepts/live-game-session-visibility-joinability)
Describes the visibility and joinability of multiplayer game sessions and game parties.

[Multiplayer session templates](/services/xbox-services/multiplayer/mpsd/concepts/live-session-templates)
Describes a multiplayer session template as a blueprint for creating a multiplayer session.

[Session template constants](/services/xbox-services/multiplayer/mpsd/concepts/live-session-template-constants)
Describes system constants that are defined in multiplayer session templates, defining settings for a multiplayer session.

[Enable large sessions for Multiplayer](/services/xbox-services/multiplayer/mpsd/concepts/live-large-sessions)
Describes support for large sessions (more than 100 members) with Multiplayer features.

[Multiplayer FAQ and troubleshooting](/services/xbox-services/multiplayer/mpsd/concepts/live-multiplayer-2015-faq)
Provides FAQs and troubleshooting for the Multiplayer system.

[MPSD invite and activity troubleshooting](/services/xbox-services/multiplayer/mpsd/concepts/live-multiplayer-invite-troubleshooting)
Provides troubleshooting for MPSD invite and activity functionality.


## Related topics

- [Multiplayer Session Directory (MPSD)](/services/xbox-services/multiplayer/mpsd/live-mpsd-nav.md)
- [Multiplayer concepts overview](/services/xbox-services/multiplayer/concepts/live-multiplayer-concepts.md)
- [Moving from MPSD to PlayFab Multiplayer and MPA](/services/xbox-services/multiplayer/mpsd/concepts/live-mpsd-to-mlp.md)
- [Multiplayer Session Directory overview](/services/xbox-services/multiplayer/mpsd/live-mpsd-overview.md)
- [Multiplayer FAQ and troubleshooting](/services/xbox-services/multiplayer/mpsd/concepts/live-multiplayer-2015-faq.md)