tcpip_calc_server - Waits for "feval" calls from remote machine.
Listens on port 26789 and services tcpip_feval calls from the
remote macine. This server script uses tcpip_feval_server(...)
Psychtoolbox/PsychHardware/iViewXToolbox/tcp_udp_ip/tcpip/tcpip_calc_server.m