VMS Help RMS, $WRITE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    The Write service transfers a user-specified number of bytes
    (beginning on a block boundary) to an RMS file of any file
    organization.

                         RAB64 USERS (ALPHA ONLY)

       On Alpha systems, RAB64 can replace the RAB or RAB prefix
       wherever it is used with the Write service on OpenVMS Alpha
       systems.

    Format

      SYS$WRITE  rab [,[err] [,suc]]

  Additional Information (explode) :

• Returns
• Arguments
• Condition Values Returned