If you have a computer that's on the network, and that's also on a Bluetooth
network, you can make that computer into a bridge.  Be careful, though - most
discussion in this forum about bridges is how to remove them, as they are known
to cause problems with file sharing.  If you're willing to take a chance, here's
advice from Steve Winograd:
<http://www.practicallynetworked.com/sharing/xp_ics/networkbridge.htm>