Hi All. Recently at work I helped someone figure out that when working with ld, the name of a function "foo" gets turned into "_foo" by the compiler. (It took this old-timer 15 minutes to solve a problem he had been working on for two days!) I'm pretty sure this dates back to PDP-11 days. I'm wondering "why?". Why did the C compiler prepend an underscore to function names? Thanks, Arnold