> I'm not familiar enough in C to remember how variable number of arguments
> are handled in the language, but wouldn't that need to be described somehow
> in the routine declaration?  
NO! you don't have to specify anything about a routines parameter list 
in the declaration. In fact you don't actually have to
declare them at all! (doing so is a bad idea because the behaviour when 
a parameter list is not given can be somewhat counterintuitive)

It does of course have to be specified in the routines definition but 
that may be in a different "compilation unit" and therefore not 
availible to the compiler.

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