FYI I got bitten by broadcasting a message to all open windows because someone outside my working group happened to IM me to say hello but I didn't notice, so my broadcast went to the outside person as well.

Be careful!

This is (almost) what I have been looking for. I need something in between "broadcast to all open windows" and "broadcast to all contacts"

What I'd like to be able to do is select some subset of my contacts and be able to broadcast to that subset, without having to first open chat windows, etc

Thanks for making this plugin.