Hi RjT,
Yes indeed. I used Serial PPP before owning a network card.
You configure your PC to route traffic from the serial port to its internet connection.
This page has the links to the HowTos:
http://minnie.tuhs.org/twiki/bin/view/Network/WebHome
Depending on what O/S you're using have a look at "SerialPPPWithXP", "MacOSXSerialPPPWithTivo" of "NetworkingWithLinux".
Cheers, Dave.
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