Yes, Analog X is a third party freeware software utility, and the readme is included in the download. okay, as for setting up the computers first of all your going to need to make sure all the computers have static IP address, then norm for small office's is to use 192.168.X.X as these are reserved address just for small lans and will never appear on the internet.
To setup the servers(computers that connect to the internet):
Download and install Analog X proxy by following the link provided in my first post. I suggest then creating a shortcut and putting that in the startup folder so it starts automatically when the computer starts. That's all for the servers.
To setup the clients:
Open internet explorer on theses machines, click tools, internet options, connections, make sure never dial a connection is checked, then click on LAN settings, check use proxy server and then click advanced, now you type in the the servers ip address and the port for each associated service, so say one of your servers ip address's was 168.192.0.1, then you would use that address for all of the services, and then for http and secure you would use port 6588, for ftp you would use port 21, and for socks you would use 1080. Program half of you computers in this manner to point to one server and then program the other half in the same way only substitute the ip address for your second server. There are more detailed instructions in the readme included with the program. Let me know how this works.