Allows a process to associate (map) a section of its address
    space with either a specified section of a file (a disk file
    section) or specified physical addresses represented by page
    frame numbers (a page frame section). This service also allows
    the process to create either type of section and to specify that
    the section be available only to the creating process (private
    section) or to all processes that map to it (global section).

    Format

      SYS$CRMPSC  [inadr] ,[retadr] ,[acmode] ,[flags] ,[gsdnam]

                  ,[ident] ,[relpag] ,[chan] ,[pagcnt] ,[vbn] ,[prot]

                  ,[pfc]

    C Prototype

      int sys$crmpsc  (struct _va_range *inadr, struct _va_range

                      *retadr, unsigned int acmode, unsigned int

                      flags, void *gsdnam, unsigned int relpag,

                      unsigned short int chan, unsigned int pagcnt,

                      unsigned int vbn, unsigned int prot,unsigned

                      int pfc);