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  Description:  IOCTL: Check Input Status
 
  Returns a code indicating whether the device or file associated with a
  handle is ready for input.
 
  Input                Output
  ═════════            ═════════════════════════════════
  AH=44H               If function successful
  AL=06H               Carry flag=clear
  BX=handle            and, for a device:
                       AL=00H if device not ready
                          FFH if device ready
                       or, for a file:
                       AL=00H if file pointer at EOF
                          FFH if file pointer not at EOF
                       If function unsuccessful
                       Carry flag= set
                       AX=error code
                                    -♦-