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trigger once
From Quake Wiki
Trigger Once:
Description: A trigger that fires only once. Is triggered by walking onto it.
| classname | "trigger_once" |
| style "#" | 32 works |
| killtarget | Kills something. |
| target | Trigger name of targe. |
| sounds | Sound made when triggered. See Table below. |
| wait | Delay until it retriggers, some classes only (optional) |
| delay | Delay before action is triggered. |
Sounds - the different sounds triggers can make when activated.
| Blank means no sound. | |
| 1 | Secret sound |
| 2 | Beep Beep |
| 3 | Large Switch |
| 4 | Set message to text string, can be used to show messages. |
Source: http://www.gamers.org/dEngine/quake/QDP/qmapspec.html#2.3.1