INT 21 - DOS 2+ - IOCTL - READ FROM CHARACTER DEVICE CONTROL CHANNEL

	AX = 4402h
	BX = file handle referencing character device
	CX = number of bytes to read
	DS:DX -> buffer
Return: CF clear if successful
	    AX = number of bytes actually read
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #01680 at AH=59h/BX=0000h)
Notes:	format of data is driver-specific
	  (also see separate entries below for some specific cases)
	this function was not supported by Digital Research's DOS Plus
SeeAlso: AX=4400h,AX=4403h"DOS",AX=4404h"DOS",INT 2F/AX=122Bh