I think that you'd be able to see other computers on your home network if you have WiFi access. I don't know thought since I don't have a WiFi card installed on mine. Perhaps the software that is included with the WiFi card will allow you to access other computers on your network. Get a WiFi and find out, there's also a program that you can install on your Treo and on your computers that will allow you to access your computers. Avvenu (I did some research before posting this reply) here's the link to download the software and it's FREE!!!
http://www.palm.com/us/software/avvenu/
oh yeah, keep in mind that I haven't used this software myself and do not plan too... ha ha