Creates a logical name and specifies its equivalence names.
    On Alpha and Integrity server systems, this service accepts 64-
    bit addresses.
    Format
      SYS$CRELNM  [attr] ,tabnam ,lognam ,[acmode] ,[itmlst]
    C Prototype
      int sys$crelnm  (unsigned int *attr, void *tabnam, void
                      *lognam, unsigned char *acmode, void *itmlst);
Additional Information:
explode
extract