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

215FE0 - LANtastic - GET DOS SERVICE VECTOR