IPNetRouter or Vicom Internet Gateway are your frients. They will allow you to share your internet connection with any computer on the network architecture of your choosing. They will also allow you to employ "ganging." Say you need some extra bandwidth and you've got a few modems and a few telephone lines. As more bandwidth is required, the software will make more internet connections. Internet Gateway does this, but I'm not sure if IPNetRouter will.

Peace,
Drew
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Power to the PowerPC!