From the looks of his join date he is still on post approval... he probably saw his first post didn't appear and so made a new one...
Both of your questions are answered in the manual... Also if you use the search box at the bottom of the page you could find the answers you're looking for...
Or if you open up the terrorstrike.fpm which installs to your mapbank (I think) with the game it has both a door which uses a key and a dynamic light which turns off and off with a switch... you could study it to see how it works...
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