Russ, yes. But only those machines on the lan will be able to flush to the pproxy as it is behind a proxy server or nat server (for most people, I'm not sure about your internet configuration).
Dark, if you want to run a pproxy server, that is accessible to both internal and external machines (of your lan), then youe need to have a valid IP address that anyone on the internet can have access to, not a 192.168.0.x behind some firewall that is using a proxy server to allow internet access to. Say you have a Win98 or 2k machine that uses ICS to allow a slave machine to access the internet. The slave machine cannot have a pproxy that is accessible from outside clients, only internal clients to the lan. THe 98Se or 2k machine can have a pproxy that can be used by both your lan and anyone on the internet.
Hope I haven't confused anyone besides me. 😉
Jay