Ok, Well, I took a minute to try out pairing my Treo to my Windows XP laptop to see what I could do. The short answer is that the process works and I can get online using the phone as a modem.
The long answer is that it happens in typical windows fashion. I paired the phone using the XP bluetooth tools. During that process it asks which services you would like to use with the phone, one of them is to use the phone as a modem. So far so good. As soon as I clicked on the check box though I swear to you 4, yes FOUR wizards opened on my screen. Some installing drivers, others asking for information. About 60 seconds later things started calming down and I went through the remaining wizards. Basically, they just want to know how to connect with bluetooth and what to dial when connected. Ok, fine, ugly but functional. Once the wizards were gone I went looking for how to initiate the connection as found it under network connection. I right clicked, chose connect and was prompted with the standard windows dialer screen, very similar to how you would connect to a VPN. I put in the user name and password info as before plus the phone number and clicked connect. All is well, just remember to activate modem link one the phone before hand!
Something else of note, on the Treo you need to ‘deactivate’ modem link when you are finished as the device does see it as a type of phone call. Once done using it as a modem if you want to begin receiving calls and having the phone check email it will need to be deactivated.
So there you have it! If you want to check out Part 1 (setting this up on a mac) Click Here
Topslakr