All of the standard DECnet security features are supported, including
   access-control strings within node specifications, incoming and
   outgoing proxy login access, etc.

   Example of an access-control string in a node specificiation:

          $ PEEK NODEA"USERB PASSWORDB"::J_DOE

   Peek will be run from the account USERB on NODEA and will watch
   process J_DOE on NODEA.