Autologout of unused terminals

[Guy Harris]

>Hmmm, mine just sleeps X minutes, then asks the terminal what type it is.
>Go back to sleep, ad nauseum.  Has the advantage that the responce comes
>from the terminal itself, then through the data lines, muxes, data switches,
>and god knows what else, instead of the cpu just talking to itself.

Has the disadvantage that it doesn't work worth a damn if:

	1) your terminal doesn't have a sequence that provokes it into
	   identifying itself;

	2) your program doesn't know the sequence for your terminal, or
	   doesn't know what kind of terminal it is;

and isn't very polite if it breaks into the middle of some output to
send that sequence and the sequence happens to cause the output to be
scrambled.