hero as modem on vista and XP

[sdb]

I have managed to use the hero as a modem with vista - even though i have now deleted the sync software.

I have an xp net book which i also want to connect with the phone as a modem -

do i need to install the sync software to use it as a modem -

will this cause a problem if the phone is trying to sync to 2 machines

Can i just download the modem drivers and not the sync software

Ta

Hope you can help