X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 2a - microsoft networks

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INT 2A - Microsoft Networks - CHECK DIRECT I/O
        AX = 0300h
        DS:SI -> ASCIZ disk device name (may be full path or only drive
                specifier--must include the colon)
Return: CF clear if absolute disk access allowed
Notes:  do not use direct disk accesses if this function returns CF set or the
          device is redirected (INT 21/AX=5F02h)
        may take some time to execute
SeeAlso: INT 13, INT 25, INT 26, INT 21/AX=5F02h

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