.Map :: MoHAA Mapping

well what i am trying to do is lets say for instance a mortor explosion set off by a trigger switch for instance how is this done i cant seem to find any tuts anywhere
any help would be great
THANKS LONGSHANKS..............

This tutorial map has a mortor (a trigger_use) that fires at three random spots when triggered.

http://pages.sbcglobal.net/tltrude/Temp ... ngdoor.zip