How about the following.

A Plugin that reads the chat window of the room the client is in, and then acts on given commands.

ATM, I have a box running a client playing Music through our server, in our Music channel, I was thinking if a plugin or script or something could be made to enable commands to be typed into the chat window of the client, and the DJ client reads these and acts.

Things like.

/info - display song title

these commands would if possible interact with windows media player, or some other music playing application.

ATM, I'm using media player.