> ## 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.

# Concepts

> Reference and concepts for Multiplayer Session Directory (MPSD) in the XBOX Game Development Kit (XBOX Services). Includes concepts and API guidance.

Explore concepts topics for XBOX game development.

<CardGroup cols={2}>
  <Card title="Game session visibility and joinability" icon="people-group" href="/services/xbox-services/multiplayer/mpsd/concepts/live-game-session-visibility-joinability">
    On XBOX One (or later), the visibility and joinability settings for game sessions and game parties control access to multiplayer…
  </Card>

  <Card title="Enable large sessions for multiplayer" icon="users-line" href="/services/xbox-services/multiplayer/mpsd/concepts/live-large-sessions">
    This topic describes how to create a multiplayer large session that can handle more than 100 members.
  </Card>

  <Card title="Multiplayer session directory (mpsd)" icon="lightbulb" href="/services/xbox-services/multiplayer/mpsd/concepts/live-mpsd-concepts-nav">
    This section describes the concepts of the Multiplayer Session Directory (MPSD) service.
  </Card>

  <Card title="Multiplayer session advanced topics" icon="people-group" href="/services/xbox-services/multiplayer/mpsd/concepts/live-mpsd-details">
    a id="top"/a
  </Card>

  <Card title="Moving from mpsd to PlayFab multiplayer" icon="server" href="/services/xbox-services/multiplayer/mpsd/concepts/live-mpsd-to-mlp">
    This document is intended for game developers who are currently using MPSD and want to move to using PlayFab Multiplayer and MPA for their…
  </Card>

  <Card title="Multiplayer faq and troubleshooting" icon="circle-question" href="/services/xbox-services/multiplayer/mpsd/concepts/live-multiplayer-2015-faq">
    No, mixing MPA and MPSD calls in a title is not possible.
  </Card>

  <Card title="Mpsd invite and activity troubleshooting" icon="triangle-exclamation" href="/services/xbox-services/multiplayer/mpsd/concepts/live-multiplayer-invite-troubleshooting">
    The following guide is a starting point to assist titles with troubleshooting of invite and activity functionality using the MPSD.
  </Card>

  <Card title="Session template constants" icon="people-group" href="/services/xbox-services/multiplayer/mpsd/concepts/live-session-template-constants">
    a id="top"/a
  </Card>

  <Card title="Multiplayer session templates" icon="people-group" href="/services/xbox-services/multiplayer/mpsd/concepts/live-session-templates">
    a id="top"/a
  </Card>
</CardGroup>

## See also

* [How to](/services/xbox-services/multiplayer/mpsd/how-to/index)


## Related topics

- [Concepts](/services/xbox-services/multiplayer/invites/concepts/index.md)
- [Matchmaking concepts](/services/xbox-services/multiplayer/matchmaking/concepts/live-matchmaking-concepts-nav.md)
- [Multiplayer concepts](/services/xbox-services/multiplayer/concepts/live-multiplayer-concepts-nav.md)
- [Reputation concepts](/services/xbox-services/community/reputation/concepts/live-reputation-concepts-nav.md)
- [Invites concepts](/services/xbox-services/multiplayer/invites/concepts/live-invites-concepts-nav.md)