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INT 21 - DoubleDOS - SET/RESET KEYBOARD CONTROL FLAGS
        AH = E8h
        AL = 00h set flags for this program
           = 01h set flags for other program
        DX = keyboard control flags (bit set enables, cleared disables
            bit 0: menu
            bit 1: exchange
            bit 2: entire keyboard enable/disable
            bit 3: Ctrl-C
            bit 4: Ctrl-PrtSc
            bit 5: Alt/Erase
            bit 6: Ctrl-Break
            bit 7: Ctrl-NumLock
            bit 8: shift-PrtSc
            bit 9-13: undefined
            bit 14: cancel key (clear keyboard buffer)
            bit 15: suspend key
Return: DX = previous flags
Notes:  disabling Ctrl-PrtSc will allow the program to intercept the keystroke;
          disabling any of the other keystrokes disables them completely
        identical to AH=F8h
SeeAlso: AH=E2h"DoubleDOS",AH=E3h"DoubleDOS"

See Also: 21E1
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