Function 4402h (68-2)    IOCTL: Read from Character Device

Reads a control string from a character device.

On entry:      AH         44h
AL         02h
BX         Device handle
CX         Number of bytes to read
DS:DX      Data or Buffer

Returns:       AX         Error code, if CF is set

Error codes:   1          Device doesn't support control strings

                                                                          

This subfunction reads CX bytes of data from the character device's
control channel into either DS:DX or memory pointed to by DS:DX.  How
data is read is defined by the device driver.  Data can be read only
if the device can process control strings.

See also: 44h
See also: 4403h

4402h (68-2) IOCTL: Read from Character Device