Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     When the system Break flag is ON, the keyboard is examined for
     CTRL+C entry whenever any operating system input or output is
     requested; if one is detected, control is transferred to the
     CTRL+C handler (Int 23h). When the Break flag is OFF, MS-DOS
     checks for CTRL+C entry only when executing the traditional
     character I/O functions (Int 21h Functions 01h through 0Ch).
 
     The Break flag is not part of the local environment of the
     currently executing program; it affects all programs. An
     application that alters the flag should first save the flag's
     original status and then restore the flag before terminating.
                                    -♦-