[IRCServices Coding] questions with unreal and sjoin

[Ron]

i am a little confused with the UNREAL_HACK define. i see the #ifndef/#else in 
sjoin.c for changing the way it sends the SJOIN.  maybe i dont fully 
understand the way the modules work, but why is it required to #define 
do_sjoin, init_sjoin, and exit_sjoin to *_unreal?

thanks for the help