Explicitly starts or stops the multiplayer service connectivity via RTA. Enabling the RTA subscription enables: 1. Callbacks when the local Users’s sessions change, using the MultiplayerSession object. Handlers are added with XblMultiplayerAddSessionChangedHandler. 2. Automatic removal of members from sessions when the RTA connection underlying this multiplayer subscription is broken.
xblContext   _In_
Type: XblContextHandleXBOX live context for the local user.subscriptionsEnabled   _In_
Type: boolTrue to enable subscriptions and false to stop them.
This method immediately enables the RTA connection, but the in order to receive session changed callbacks, the session must be written again after enabling sunscriptions.