The server/client system comprises a server and at least one client which is connected to said server via a communication line and is provided with at least one I/O port, and is so configured that said server is provided with a device driver for controlling said I/O port, and a virtual I/O port for providing...http://www.google.fr/patents/US7464133?utm_source=gb-gplus-shareBrevet US7464133 - Server/client system
