Problem
1. How can romeo running Netscape on his machine saturn write its output to juliet's display on a remote machine uranus? Do both users need to run X?
2. Why is the DISPLAY variable more convenient to use than the -display option?
3. Explain how the general mail handling scheme changes when a user connects to the mail server over a dialup line.
4. Explain the significance of each word in the acronym URL. What happens if you leave out the port number in the URL?