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INT 21 - LANtastic - GET DOS SERVICE VECTOR
        AX = 5FE0h
Return: CF clear if successful
            ES:BX -> current FAR service routine
        CF set on error
            AX = error code
Note:   the service routine is called by the LANtastic redirector whenever DOS
          may safely be called, permitting external TSRs and drivers to hook
          into LANtastic's DOS busy flag checking
SeeAlso: INT 28,INT 2A/AH=84h

See Also: 215FE1
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