Stanley, all of your electronics devices like dvd players, receivers etc, have little IR sensors on the front of the windows so you can point your remote at it to perform your functions. itunes resides on your computer, and unless your computer came with a remote control and a sensor on the front that works with the remote you have no way to control it. A wifi enabled pda device that's mapped through your netowrk might be the answer for you (though I'm not familiar with mac pda's). We've integrated that into many systems.

Brian @ Connect Source