ID:161034
 
I'm not quite sure what #define is used for. I've seen it a lot, and I've read the entire DM Guide, but it only briefly covers this bit of code. Can someone please explain it and give an example?
These things are documented. Use the DM Reference for this kind of information:
http://www.byond.com/docs/ref/
Also available through pressing F1 in Dream Maker.