How to make domain point at world-facing page?

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http://forums.hostgator.com – Is there a way to make a file of my choosing point at the world? For example, when I type www.mydomain.com into a web browser it displays the index for the root (/) folder; however, www.mydomain.com/basepage.html is the start page of simple HTML that I’d like the world to see. It will contain some link to Wordpress, forums, etc. How can I make www.mydomain.com point right to /public_html/basepage.html? Thanks! (HowTos)