The BECOME Command

               The BECOME command allows a privileged user  to  assume
          almost  any  attributes of any user in the UAF.  The program
          requires CMKRNL privilege, since the information it  changes
          is in protected memory.

               There is help for BECOME in the file  BECOME.HLP.   The
          program   is   pretty   much  self-explanatory,  I  believe.
          /USERNAME and /UIC are the defaults, which may be changed by
          editing  the BECOME.CLD file.  If you plan to put the BECOME
          executable somewhere other than SYS$SYSTEM,  the  .CLD  file
          will need to be edited to reflect the new location.

               BECOME is a command, and the command definition for  it
          is  in  the aforementioned .CLD file.  See the AAAREADME.1ST
          file  for  INFORM  for  information  about  installing   the
          command.

               We have found BECOME very useful at ECS, since we  have
          a  number  of  'development' accounts (privileged) which are
          very project-specific.   BECOME  allows  us  to  keep  these
          quotas  and privileges separate without having the danger of
          the  account  being  broken  into  -  since  they  are   set
          /FLAGS=DISUSER  in the UAF!  Also, BECOME is very useful for
          moving files around without having to look up a UIC and then
          set it.

               BECOME tries to grab CMKRNL, so if your  AUTHPRIV  mask
          specifies either CMKRNL or SETPRV (regardless of the CURPRIV
          mask), you can use it.  When munging privileges, it modifies
          ONLY the CURPRIV mask.

               A word of caution, and a note  on  our  implementation:
          DO  NOT  INSTALL  BECOME!   It  is a very dangerous program,
          having essentially the same implicit hazards of  SETPRV  and
          DETACH,  and  should be used ONLY by responsible people.  At
          ECS, we have two sets of  commands:   those  the  users  can
          execute, and those available to the staff.  The latter are a
          superset of the former.  The users are  not  even  aware  of
          such  programs  as  BECOME, as the help is in a help library
          pointed to by a GROUP logical name  available  only  to  the
          staff groups.  The command set is set up by the system login
          procedure  (SYS$SYLOGIN),  and  the  staff  command  set  is
          protected from world access.

               BECOME is usable only on VMS systems  running  V3.0  or
          higher.