[Vince]

#assert it pretty useless. You're better of using the #error directive instead. #assert will halt the compilation with some vague error if the expression that follows it evaluates to false. Like "Assertion failed: 500 == 100".

#emit puts raw amx opcodes into the file. Very advanced, even I don't know how to properly work with it.

I suggest you read the manual: http://pawnscript.******code.com/svn.../pawn-lang.pdf
Page 118 contains the information about preprocessor directives.