Hi,
It's difficult to answer this without more info. Is the Caldera box the one with the cable modem and, if so, what is the other PC running - linux /windows ? Or is it the other way round - are you trying to access, say, a windows box with internet connection from the caldera box? If this is the case and that connection is aready working you can probably use it via simple IP routing. Its also easy to share a connection on a linux box through IP masquerading using ipchains or iptables. Need more details really....
Rgds