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