Set-Up key
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The Set-Up key was a key on terminal keyboards from Digital Equipment (DEC).
It told the terminal to enter Set-Up mode: an interface for changing settings on the terminal itself, not the host it was connected to.
The DEC VT100 terminal keyboard has a dedicated key. On the DEC LK201 and DEC LK401, the F3 key is mapped to Set-Up when used with the VT2xx or VT3xx series terminals.
