RECT_TRIGGER <X1> <Y1> <X2> <Y2> [Low Z] [High Z]
This defines a rectangular radius trigger instead of the normal square one. This is most useful to place a thin trigger area in front of a door, or some place you need a wide but narrow trigger area (since normal radius triggers are square, one that you need to cover a wide area covers a lot of unnecessary space).
<X1> <Y1> define the lower left corner of the rectangle.
<X2> <Y2> define the upper right corner of the rectangle.
It's best to use your map editor to determine the exact points for the X and Y values you want (most map editors show the grid location in real time).
Press the USE button somewhere within the starting room of DOOM2 MAP01 (the room with the two pillars and the V-shaped stairs). Pressing USE in other locations should do nothing (remember to reload the map, this script will only run once).
START_MAP map01 RECT_TRIGGER 1280 3200 1920 3648 TAGGED_USE TIP "You pressed use!" END_RADIUS_TRIGGER END_MAP