Newbie: How do I change browser URL http:\\localhost:8080 to user-friendly alias [URL]?

I am somewhat new to Tomcat, and am using Atlassian's Confluence Wiki
Builder tool on Windows XP locally. I'm trying to configure Tomcat
for Confluence such that when I am in browser I can type something
like:

http://confluence.mycompany.localhost
rather than http://localhost:8080
to access the Confluence root web page.

How do I handle the Tomcat configuration to do this? I could not
configure this through Confluence Administration; nothing worked.

Fred