$UPDATE

   The Update service allows you to modify the contents of an
   existing record in a file residing on a disk device.

                        RAB64 USERS (ALPHA ONLY)

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

   Format

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

Additional information available:

Returns         Arguments       Condition_Values_Returned