VIA : http://research.microsoft.com/en-us/um/redmond/projects/virtualwifi/default.htm
Connecting to multiple IEEE 802.11 networks with one WiFi card
via VirtualWiFi Home.
(VirtualWiFi is an old project, and we started working on it in 2002. We are not actively working on this project since 2006, and will not be supporting this software at Microsoft Research. Thanks for your interest. However, the software and code will still be available for you to play around with.)
VirtualWiFi (previously known as MultiNet) is a virtualization architecture for wireless LAN (WLAN) cards. It abstracts a single WLAN card to appear as multiple virtual WLAN cards to the user. The user can then configure each virtual card to connect to a different wireless network. (more…)