Job control commands

Thinking back to the days of RSTS-E (DEC PDP-11, the first timeshare
computer I used) is there a Unix-y way to:

  * Completely suspend a running task - not just a low priority
    but totally stop it until it's later restarted
  * Attach a task from another terminal to the one I'm at now
    (I.e., I start emacs on virtual terminal 3 and I want to move it
    to virtual terminal 2)

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