- To another Ad Hoc node (peer client) directly.
- To an upstream network, through an access point (AP).
However, some adapters can also operate as 802.11 APs, behaving as a wireless bridge or router. For this, you need...
support in the wireless adapter/driver and a compatible "Soft AP" program. For example, many older wireless adapters known to be compatible with the Linux HostAP driver are listed here Linux wireless LAN drivers. A few USB adapters include Win32 SoftAP programs, such as the ZyXEL AG225H and the ASUS WL-138G.
Neither of your wireless adapters ships with a Soft AP program. However, if you're willing to run Linux on your laptop (or boot your laptop from a Linux live CD like BackTrack) your 3945BG adapter can be used with the MadWiFi driver and HostAP. To learn more, consult the MadWiFi HostAP wiki. This set-up would let you connect your Linksys G-USB as a client to another AP, put your built-in 3945BG into AP mode, and route or bridge traffic between these two wireless adapters.
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