The server is an iPad running the latest version of VideoTagger.
Set a unique name for the server in the Settings screen. This is the name that all devices connecting to the server will refer to. In theory up to 16 devices can be connected to one another.
The server can only broadcast when in a tagging screen. Tap the broadcast button at the top left of the tagging screen to start a session. The button is animated to indicate that the broadcast is active.

A broadcast can be active with or without video being recorded on the same iPad. If video is being recorded on a another device then it has to be synchronised to the events tagged during the session.