Format of VINES argument block for subfunction 0003h:
Offset	Size	Description	)
 00h	WORD	character count
 02h	WORD	error return code
 04h	WORD	socket identifier
 06h	WORD	pointer to receive buffer (see #03336)
 08h	WORD	length of receive buffer
 0Ah	WORD	message request flags (see #03331)
 0Ch 16 BYTEs	socket address (see #03328)
 1Ch	WORD	timeout value in multiples of 200ms
 1Eh	WORD	connection identifier
 20h	WORD	type of response
		0001h message received
		0002h virtual connection established
		0003h virtual connection terminated
SeeAlso: #03334,#03338