Shoutbox

OK, maybe some extra thoughts, although I'm not entirely sure if any of this is possible.  I must stress highly that I do not know what I'm talking about, but I have an idea.  If I'm wrong... I wont take offence.

I realised that I could possibly use the packet detecting to make an XBox 360 script.  I have mines with the ability to sign into another account, but lets be honest, the 360 messenger is trash.
I quickly wrote a script to change my PSM to say what game I'm playing, and it worked.  Until I realised that my script clause wasnt right, and it was actaully changing my message to the same as the other account, when it updates on messenger.

However, after a brief bit of thinking, I thought that I could fix this, if I was to enable promiscuous mode and listen for the packets from my 360.
Now, as said, newbie, but can anyone tell me if this idea is (theoretically) possible, or even how to enable promiscuous mode, or am I barking up the wrong tree completely.
Cheers guys
Leroux