The ipcserver and ipcclient programs are command-line tools for building
local-domain client-server applications. They conform to the UNIX
Client-Server Program Interface, UCSPI.

The ipcserver program listens for connections on a local-domain
stream socket, and runs a program for each connection it accepts. The
program environment includes variables that hold the local and remote
socket addresses, and the effective user and group IDs of the process
that called connect. ipcserver offers a concurrency limit on
acceptance of new connections, and selective handling of connections
based on client identity.

The ipcclient program requests a connection to a local-domain socket,
and runs a program. The program environment includes a variable that
holds the local socket address.

The ipcperl program is an example of an ipchandle server. It invokes a
perl subroutine for each request.