INT 2F - CATC USB4DOS Device Manager - REGISTER DEVICE                          
	AX = BC00h
	BL = 01h
	CX:DX -> client_info structure (see #04096)
Return: AX = client number, 0000h on failure
SeeAlso: AX=BC00h/BL=02h,AX=BC00h/BL=00h


Format of CATC USB4DOS client_info structure:
Offset	Size	Description	(Table 04096)
 00h	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.	-> Attach() worker function
 04h	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.	-> Detach() worker function