1 LOCK

 This will cause the screen to be cleared, and a logout message to be
 displayed, and the terminal to be locked, for the amount of time given.

 To get control back you must enter a CONTROL/Y, and then a Username and
 Password that corresponds to the global symbols USERNAME and PASSWORD.

 If you do not enter a CONTROL/Y before the end of the time specified you
 will be logged off.

 Format :
	$ LOCK [time_spec]

 Paramaters :

	time_spec	- Time specification, of the form HH:MM:SS, if it
			  is omitted 00:30:00 is assumed.

  Supplier
	D. Amby, so send mail to AMBY if you have problems/comments.
