VMS Help DTM, ATTACH, Example  *Conan The Librarian (sorry for the slow response - running on an old VAX)

   MAIL> SPAWN DTM
     .
     .
     .
   DTM> ATTACH/PARENT
   You have 0 new messages.

   MAIL>

   This example uses the OpenVMS Mail Utility (MAIL) command SPAWN
   to create a subprocess running Digital Test Manager. The Digital Test
   Manager ATTACH command is then used to attach the terminal back
   to the MAIL session, the parent process.