Function 4406h (68-6)    IOCTL: Get Input Status

Checks to see if the device or file is ready for input.

On entry:      AH         44h
AL         06h
BX         Device or file handle

Returns:
(file)      AL         FFh      until EOF is reached
00h      after EOF is reached

   (device)    AL         FFh      If device ready
00h      If device not ready

                                                                          

This subfunction reports the input status of the device or file. AL
returns FFh for ready and 00h for not ready (or end of file).

See also: 44h
See also: 4407h

4406h (68-6) IOCTL: Get Input Status