Compatibility: 2.0+
Expects: AX    3300H
Returns: DL    current break level (0=OFF, 1=ON)
Info: DL is returned with the current Ctrl-Break checking state.

When Break is ON, DOS checks for Ctrl-Break (or Ctrl+C) from the
console during most functions (except 06H and 07H).  When
detected, INT 23H is executed (if INT 23H has not been
intercepted, this will abort the process).

When Break is OFF, DOS checks for Ctrl-Break during standard I/O,

See Also: Fn 3301H (set break-checking state)
Fn 0bH (get input status)
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DOS Fn 3300H: Query Break-Check Flag