VMS Help CC, Run-time functions, decc$record_write  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Provides additional flexibility in manipulating and observing RMS
  structures on a per-write basis.

  Syntax:

       #include <stdio.h>

       int decc$record_write(FILE *fp, void *buffer, int nbytes);