BREAK [=] ON
    or
BREAK [=] [OFF] 

BREAK is an internal command that tells DOS how frequently to test for 
Ctrl-Break to break (interrupt, terminate) an executing program. 

Using the command BREAK ON makes a program interruptable anytime it uses
a DOS function, which is frequently.

Using the command BREAK OFF causes a program to be interruptable ONLY when
it is performing input/output to the screen, the keyboard, a printer port, 
or a communications port. This is less frequently. BREAK OFF is the default.

Entering BREAK with no options causes the current BREAK status (ON or OFF) 
to be displayed. BREAK can also be set by the BREAK line in the CONFIG.SYS
file.
