reptyr is a utility for taking an existing running program and attaching it to a new terminal, and is particularly useful for moving a long-running process into a GNU screen session.
retty is a tiny tool that lets you attach processes running on other terminals. So you were running that mutt outside of screen at your home machine and now wanna check your mail? Attach it with retty, do whatever you want, detach it again and everything is as it was before.
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