The following Editing FAQ entry contains a broken (obsolete?) link. Which is a shame, because it would've been helpful otherwise.
"INFANTRY: Unit in Tower (Beginner)
Submitted by: SFG
Credits: Enzoblue
Placing a unit in a watchtower.
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Placing a unit in a tower
First, download Arkaddy's script called Localizator.sqs found here:
http://www.ofpeditingcenter.com/cgi-bin/YaBB/Attachments/localiz ator.sqs
Place it in the mission folder of the mission you're editing.
Now go into editor. Put a Player unit near the tower you want.
Place a trigger anywhere and set Activate to Radio Alpha, change Once to Repeatedly, and put: [Player] exec "localizator.sqs" in the On Activation line.
Hit preview and climb the tower. Position youself exactly where you want the unit to be, facing the way you want him and everything.
Radio in, (0-0-1), and write the x,y,z and azimut numbers down.
Next place a unit near the tower.
Using your numbers, in his Init field type: this setpos [x,y,z];this setunitpos "UP" , and in his azimut cicle there's a place to put the exact azimut number. The 'this setunitpos "UP"' command makes it so he doesn't lay down after being shot at.
Example: this setpos [7299.05,6797.75,0.00179672];this setunitpos "UP"
You're done. Thanks Arkaddy!
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Submitted on: April 08, 2002, 00:00 "