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When you type CTRL/O (control-O), the monitor cancels output to your
terminal. This function is useful when a program begins to print a
long message that you are not interested in reading. If you do not
want to wait for the monitor to finish printing the message, you can
stop the monitor from printing the message one of two ways. First,
you can type two CTRL/Cs, but this action also stops the execution of
the program. Second, you can type a single CTRL/O.
When you type CTRL/O, the monitor continues executing your program,
but does not print any output on your terminal. The monitor begins
printing to your terminal when one of the following conditions occurs:
o The executing program requests input from your terminal.
o The program ends and returns control to the monitor.
o You type CTRL/C twice, which returns control to the monitor.
To start the output to your terminal again, type another CTRL/O.