BREAK--Examples

To specify that MS-DOS is to check for CTRL+C only while it is reading from 
the keyboard or writing to the screen or printer, type the following
command:

    break off

To specify that MS-DOS is to check for CTRL+C while it is reading from a
disk or the keyboard or writing to a disk or the screen, type the following
command:

    break on

To turn on this extended CTRL+C checking every time you start your system,
include the following command in your CONFIG.SYS file:

    break=on