Format of argument block for BH=14h:
Offset	Size	Description	)
 00h	WORD	logical unit/device number
		0000h attach any free device of the specified type
 02h	WORD	logical unit/device type
		(3270/SNA) 01h, 02h, or 03h
		(3270/BSC) 02h display
		(3270/BSC) 03h printer
 04h	WORD	pointer to WORD buffer for attached logical unit/device number
SeeAlso: #03357,#03359