servlet startup

[Paul_Wallace]

Hi, 
        Further to a posting made a while ago - I wish to define some 
session variables on the startup of Tomcat. I have added:

    <listener>
        <listener-class> com.mycomp.servlet. LoadMyServletAtStartup 
</listener-class>
    </listener>

to conf/web.xml

and have my servlet source. Where (if anywhere specific) must I place it? 
Have I edited the correct web.xml?

Thaks

Paul.