attaching a job, changing the tty of a process

[Daniel Hitt]

Given a job running on a terminal, how can it be moved to another terminal?

For example, person A may be running some interactive program P on
terminal X, when person B comes up and needs to use terminal X.

Person A may then suspend program P by typing kill -STOP <P's pid>
on terminal Y.  How can person A then resume P on terminal Y?

dan