# API

Overview description of the functionality of Client, Message, and functionality related to communication with HoloPlay Service.

* [HoloPlayCore.Client](https://lfdocs.lookingglassfactory.com/legacy/legacy-software/corejs/api/client) — A class representing a client to communicate with HoloPlay Service.
* [HoloPlayCore.Message](https://lfdocs.lookingglassfactory.com/legacy/legacy-software/corejs/api/message) — A class to represent messages being sent over to HoloPlay Service.
* [HoloPlay Service Related](https://lfdocs.lookingglassfactory.com/legacy/legacy-software/corejs/api/hops-related) — Further information on HoloPlay Service related fields, quilt settings, and error codes.