Multiple AIs can use single holopad

http://i.imgur.com/j0QOsQg.png
First babysteps coding. This bugged me when I was AI in 3 AI round. Now any number of AIs can use a single holopad. However, they cannot hear each other say things via holopad. I didn't want to dig into say code too much, some advice on that would be appreciated. Do let me know if there's poor code in here.
you probably want use_power to be based on the amount of active holos for EXTRA IMMULSIONS