Disabling all examples etc with Tomcat5

Hello,

kind of a newbie question, most likely also answered earlier aswell, but
I'll try my luck anyway...

So, we are setting up a environment with Tomcat5, which will be webserver
for another application, which means, that tomcat is not ment to be showing
anything to internet. So, the question is, how to disable all examples with
tomcat5, how to define what page is shown, when user 'opens' tomcat port :80
or :8443. Also help with tightening tomcat5 security as tight as possible is
very welcome.

Pls, help me.