XCP is a protocol for High Bandwidth Delay Product Networks, compare TCP.
Information:
SallyFloyd?, Congestion Control for High-Bandwidth-Delay-Product Networks: XCP vs. !HighSpeed? TCP and !QuickStart?, ICIR? Wednesday Lunch, September 11, 2002
PDF Version: 
http://www.icir.org/floyd/talks/ICIR_Sept2002.pdf
PostScript Version: http://www.icir.org/floyd/talks/ICIR_Sept2002.ps
See Also: http://www.icir.org/floyd/hstcp.html
