X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - dos 2.x and 3.3+ internal

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INT 21 - DOS 2.x and 3.3+ internal - AVAILDEV
        AH = 37h
        AL = subfunction
           02h read device availability (as set by AL=03h)
                Return: DL = device availability (always FFh under DOS 4.0)
           03h set device availability, where:
                DL = 00h means \DEV\ must preceed device names
                DL <> 00h means \DEV\ need not preceed device names
Return: AL = FFh if invalid subfunction
Notes:  all versions of DOS from 2.00 allow \DEV\ to be prepended to device
          names without generating an error even if the directory \DEV does
          not actually exist (other paths generate an error if they do not
          exist).
        although DOS 3.3+ accepts these calls, they have no effect

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