To learn more about trademarks, a good place to start is "Trademark Basics" at Identity Research Corporation, www.idresearch.com. If you're not sure whether you should say "I cleaned my glasses with a Kleenex" or "I cleaned my glasses with a tissue," then you need to read the "Trademark Resources" section of the International Trademark Association Web site at www.inta.org. The U.S. Patent Office's "Basic Facts About Registering a Trademark" at www.uspto.gov/
web/offices/tac/doc/basic will fill you in on the process of registering a trademark. In order to register a trademark, you need to make sure that no one else is already using it. This process is called trademark search, and you can learn more about it at Thomson & Thomson Trademark & Copyright Services, www.thomson-thomson.com. For an example of how seriously companies take trademark rights, read the "Legal Notice" section of the LEGO Worlds Web site at http://www.lego.com/info/legal.asp (click "Grown Ups," "About Us," then "Legal Notice").