The VMS Authorize Utility (AUTHORIZE) allows you to control access
  to the system and allocate resources to users.

  More on-line help is available  from  the  Authorize  Utility.  To
  invoke  AUTHORIZE,  enter the following command in response to the
  DCL prompt:

  $  RUN SYS$SYSTEM:AUTHORIZE

  The utility responds with the prompt:

  UAF>

  After you invoke AUTHORIZE, you can  enter  HELP  or  any  of  the
  AUTHORIZE commands.