Example

  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.