Int 7D Fn 09  - Scsilink - Poll Request                                    [-]

   AH = 09h
   AL = target ID

Return: AL = status
       FEh resident driver experienced SCSI error
       FFh resident driver handleded event
Desc:  give any drivers chained onto INT 7D a chance to handle an exception
     not specifically handled by the calling program

Notes: this service exists so that resident disk servers, etc. can continue
     running even while debuggers and profilers are active
   the resident driver assumes that a connection has been established and
     attempts to leave the target connected