[273,114]	Demo many ASTs doing cute things.

		Keyboard ASTs feed a ring buffer.
		Time-out ASTs milk the ring buffer.
		Offspring status ASTs tell us when a worker task has
		done it's thing.

1.C		Demo astset() astx(), using MKRT$.

2.C		Demo type-in asts, and time-out asts.

3.C		Demo type-in asts, and timeout asts, with a common event flag.

4.C		3.C, + background worker task emmitting status. Fun.

5.C		Demo Send, Request and Connect SDRC$.

		All this slime is a demo for a nice user-resistant terminal
		server. (Being written, but not yet fit for DECUS. Watch your
		tapes. If I haven't died by the time we perpetrate the NEXT
		bloody Australian tape, it will be there.)
