INT 17 - Shamrock Software NET.24 v3.11+ - TRANSMIT COMMAND, WITH HANDSHAKE     
	AX = 2409h
	BX = target address
	CX = number of data bytes
	DL = command code to send
	DS:SI -> data bytes for command
Return: AL = status (see also #00640)
	    03h no response
	    06h remote currently unable to perform command
SeeAlso: AX=2405h,AX=2408h