The iChat Status reactor changes your iChat status and away message.
For call events, the status and message are changed when the call starts and reset when the call ends.
For proximity events, the status and message are changed when the device exits range and reset when device returns.
For all other events, the status and message are changed but not reset.

Away message: The iChat status message to use when busy or away.
The DVD Player reactor pauses and resumes Apple DVD Player.
For call events, DVD Player is paused when the call begins and resumed when the call ends.
For proximity events, DVD Player is paused when the device exits range and resumed when device returns.
For all other events, DVD Player is paused and resumed after a 5 second delay.
The iTunes reactor pauses and resumes iTunes.
For call events, iTunes is paused when the call begins and resumed when the call ends.
For proximity events, iTunes is paused when the device exits range and resumed when device returns.
For all other events, iTunes is paused and resumed after a 5 second delay.