

		ESSENTIAL COMMANDS


	To execute any command on the computer you must type
	the command and press the return key.

	The following are commands that interrupt the computer
	and may be executed at any time:

	Because they interrupt the computer at unexpected times
	they should be used with caution.  To invoke them you
	must press both the control key and, at the same time
	the indicated key.

	Control/C--This interrupts the operation of a program.
	Everything that you were doing is lost.  Generally
	a drastic measure taken when all else fails.

	Control/O--This causes the printout you are receiving
	to stop being printed although the program continues.

	Control/S--This causes the printout to stop.  Do this
	if the information is flying by on the screen too fast
	for you to read it.

	Control/Q--This reactivates printout.  By alternating
	between Control/S and Control/Q you can control the
	printout on the screen.

	Control/Z--This indicates to the computer that it
	has reached the end of a file.  It causes whatever
	you were doing to stop or abort, but it is much
	kinder than a Control/C.

	Control/U--This causes everything you have printed
	on a line to be deleted.  You can then start over.
	If you have made a mistake in a command that you
	cannot correct, by pressing Control/U you can start
	over without having to pass a bad command to the compu-
	ter. 
	
	Control/R--Reprints the line you have just typed.  Useful
	when you have made a lot of mistakes and hence deletes
	and want a clear copy of what you have.

	Control/T--Gives the run time system characteristics of the
	program you are running.


