Print Servers are briefly mentioned and defined in a movie entitled "Managing Your Net Equipment With Your Web Browser" which has been completed, and a high-resolution version can be purchased as a component of our "Networking Fundamentals" DVD set from our online store. CLICK HERE for details.
If you want to make your Print Server available on the worldwide Internet, you will need to assign it a static IP address on your local network, you will need to configure your NAT router for Port Forwarding, and you may want to take advantage of "Dynamic DNS" services. You can learn more about the basics of Internet Servers from other movies at AskMisterWizard.com. Look especially for these:
NAT Routers Part 3: Port Forwarding
Configuring Your Internet Connection Part 2: Static IP Configuration