I have no glass texture and i have downloaded all .wad files for 1.6
There are glass textures in halflife.wad
Also how do i make a button that has a certain function such a "slay all cts"
or "slay all ts"
There is no built-in way to do this. And it may not be possible at all, unless each team is stuck in their own area and can't enter each other's area. Then you can just use a couple of trigger_hurts.
I tried to get it to work one time using an infinite loop of triggers set off when each player spawns. One loop for T one loop for CT. Each one contains multithreaded message-events, one for each player. The loop gets trigger_changetargetted to a trigger_hurt when you push the button.
I never got it to work but I think I was close.