WARNING:  Be prepared to restart Tomcat many, many times.  Any time a Java file is recompiled, you will have to restart Tomcat so that the latest copy is loaded.

Make sure that Tomcat is started.  Since it does run as a webserver as well, it's not necessary to have Apache running.  You can use Apache, just make sure it's running also and that you use the correct port number.

Open your browser.

Type the following into your Address/Location bar:
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http://localhost:port/cis237/ServletName?process=X
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where:
port is the port number you assigned to Apache (if you are running it) or Tomcat 
ServletName is the name of your servlet class file
X is the code letter to get the list.

To start my application, I would type the following into my Address/Location bar:
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http://localhost:8080/cis237/CIS237Servlet?process=L
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I am calling my servlet (CIS237Servlet) and passing the parameter (L) in the QueryString for the ViewList process.