trigger_counter
Used to combine multiple inputs (buttons, triggers, etc) to one target.
1.Firstly, create a good sized room (300x300x300) and place your info_player_start and a light in there.
2.Next add a brush to the
room with the "trigger" texture on it. Apply the trigger_counter entity to it.
Give it a
"target" "lights"
"targetname" "multi".
3.Place 3 buttons on a wall,
and give each a
"target"
"multi"
4.Add a light entity. Give it a
"targetname" "lights" (also, for this example, lets make the light start off, so it turns on when all 3 buttons are pressed) Give it a
"spawnflags" "1" (for START OFF)
5.Compile your map and check it out in Quake2. Here's a sample map showing the example.