No, not on Emby server. It just uses regular remote-control (session) API calls which are standard on Emby server. Every client (I've tested -> WebUI and Emby app) supports them and that's all needed. btw, WebUI (as a remote client) is imho not completely following the "specifications". e.g. A seek command received when stream is paused also toggles Play, which it should not do. Also a PlayNow command plays trailers (if enabled) instead of directly playing the requested content. Emb