[plt-scheme] Creating Executable

Hi all,

I'd like to know more details about creating executables.
I've been reading docs and I've two questions to make. 
When, under DrScheme I create an executable, an executable is
created but it doesn't work. How will it know which function to
call when we run it? Is there any special syntax?
What's the difference of creating stand-alone executables from
scheme or native code?

Best regards,

-- 
Paulo J. Matos : pocm(_at_)mega.ist.utl.pt
Instituto Superior Tecnico - Lisbon    
Software & Computer Engineering - A.I.
 - > http://mega.ist.utl.pt/~pocm 
 ---	
	Yes, God had a deadline...
		So, He wrote it all in Lisp!