> ## 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.

# 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.

> [card] [Game session visibility and joinability](https://docs.xbox.com/services/xbox-services/multiplayer/mpsd/concepts/live-game-session-visibility-joinability.md)
>
> On XBOX One (or later), the visibility and joinability settings for game sessions and game parties control access to multiplayer…

> [card] [Enable large sessions for multiplayer](https://docs.xbox.com/services/xbox-services/multiplayer/mpsd/concepts/live-large-sessions.md)
>
> This topic describes how to create a multiplayer large session that can handle more than 100 members.

> [card] [Multiplayer session directory (mpsd)](https://docs.xbox.com/services/xbox-services/multiplayer/mpsd/concepts/live-mpsd-concepts-nav.md)
>
> This section describes the concepts of the Multiplayer Session Directory (MPSD) service.

> [card] [Multiplayer session advanced topics](https://docs.xbox.com/services/xbox-services/multiplayer/mpsd/concepts/live-mpsd-details.md)
>
> Deep dive into MPSD sessions covering member properties, capabilities, size limits, user states, timeouts, arbiters, and process lifecycle management.

> [card] [Moving from mpsd to PlayFab multiplayer](https://docs.xbox.com/services/xbox-services/multiplayer/mpsd/concepts/live-mpsd-to-mlp.md)
>
> 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] [Multiplayer faq and troubleshooting](https://docs.xbox.com/services/xbox-services/multiplayer/mpsd/concepts/live-multiplayer-2015-faq.md)
>
> No, mixing MPA and MPSD calls in a title is not possible.

> [card] [Mpsd invite and activity troubleshooting](https://docs.xbox.com/services/xbox-services/multiplayer/mpsd/concepts/live-multiplayer-invite-troubleshooting.md)
>
> The following guide is a starting point to assist titles with troubleshooting of invite and activity functionality using the MPSD.

> [card] [Session template constants](https://docs.xbox.com/services/xbox-services/multiplayer/mpsd/concepts/live-session-template-constants.md)
>
> Reference for predefined MPSD session template constants (system, capabilities, metrics, memberInitialization, QoS) that configure XBOX multiplayer sessions.

> [card] [Multiplayer session templates](https://docs.xbox.com/services/xbox-services/multiplayer/mpsd/concepts/live-session-templates.md)
>
> Learn how MPSD session templates work as blueprints for creating multiplayer sessions, including template versions and examples you can copy and modify.

## See also

* [How to](https://docs.xbox.com/services/xbox-services/multiplayer/mpsd/how-to/index.md)


## Related topics

- [Concepts](https://docs.xbox.com/services/xbox-services/multiplayer/invites/concepts/index.md)