INT 61 U - PCIBM PC/TCP(Transmission Control Protocol) A higher level (session layer) of the TCP/IP protocol suite.  See also IP, TCP/IP. kernel v2.1+ - "icmp_destun" - ???
	AH = 34h
	???
Return: ???
Notes:	this function is described as "reserved" in the v2.2 documentation
	this function is not supported by Beame&Whiteside's BWPCTCP v3.0a shim