I have a dell latitude d360 with a wireless card. I need to connect to our...

[What The????]

...wireless network and? to a self powered wireless LAN module at the same time. Normally the LAN module would be connected to the wireless network but sometimes I must leave the network area and that causes me to lose the ability to talk to the module unless it is hardwired or specifically set as the network of choice. I have heard that it is possible to set this up but cannot find out how. Any help would be extremely helpfull. Thanks!