This tutorial file with playable map (door2.pk3) and source file (door2.map)
http://cyberzilla.net/mohaamapping/door2.pk3 (236)
http://cyberzilla.net/mohaamapping/door2.map
It can be used to see how many kinds of doors, elevators, garage doors, windows can be operated and built/copied into your own map/creation. Tltrude is original scripter.
bobzilla