0:471h                   Break Key State

Length: 1 byte

Signals whether or not the break key combination (Control-Break) was
pressed.

                                                                          

Notes:         If bit 7 of this byte is set, the break key
combination was pressed.

This byte is never reset to 0; hence the first
instance of the break key combination will set bit 7
of this byte and the value of the byte will remain
this way until the system is powered off or reset by
the user.


0:471h Break Key State