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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.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 a 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 a 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.
                                    -♦-