In article <[log in to unmask]>, George <[log in to unmask]> writes: > 1) What is the path to the system compiler headers? Look in C$INCLUDE: for them. For example, C$INCLUDE:MMAN.H. > 2) Why does including a header like <mman.h>, as the help page says, > NOT define such critical values as PROT_READ, MAP_PRIVATE, and even > the prototypes themself? Actually, they are, but only if the system is running OpenVMS 7.0 or greater (the first version to support these). We're running OpenVMS 6.2. I've got a newer version of C to install that is supposed to allow the use of some of these new features without upgrading to OpenVMS 7.0. Contact me for more information. -- Kent Covert, Software Coordinator Miami Computing and Information Services Miami University, Oxford, OH [log in to unmask]