help with va_list etc

From: Alex (yep_at_yep.com)
Date: 12/30/04 

Date: Thu, 30 Dec 2004 17:53:47 +1100

Can anyone point me to any good online references
about the va_arg() va_list() functions/macros

I googled and found a couple of things, but what I found, failed to explain
how it really works and give a easy to follow example program

Any pointers appreciated.