A system for emulating a local network on top of a global communication network that includes Local Area Network (LAN) LAN Emulating clients units (LEC) and a LAN Emulating server (LES) which are connected to the global network, and a Broadcast and Unknown Server (BUS) functionality for relaying messages...http://www.google.com.tw/patents/US7461157?utm_source=gb-gplus-share專利 US7461157 - Distributed server functionality for emulated LAN
