ucspi-tcp is a public domain Unix TCP command-line tool for building TCP client-server applications. It consists of super-server tcpserver and tcpclient application. From "Life with qmail", Dave Sill, 2 January 2006 (Appendix B.3.): ucspi-tcp is an acronym for UNIX Client-Server Program Interface for TCP, and it is pronounced ooks-pie tee see pee. tcpserver features built-in TCP Wrapper-like access control. ucspi-tcp competes with several other programs mconnect client supplied as part of SunOS faucet and hose, part of the netpipes package netcat External links http://cr.yp.to/ucspi-tcp.html Unix network-related software Transmission Control Protocol Public-domain software with source code