I've always worked in situations where we had at a minimum a dedicated 56K line -- not a dialup. The dialups I've worked with involved POTS connections (several numbers) rolling over into a mux and from there into a port board. Otherwise, it's just been one PC, one modem, one connection.

I assumed that was was wanted was a way to connect both PCs into a a dialup situation where the PCs could surf independently (if that makes sense).

I'm glad to know what can be done, really.