How to use a servlet as Domain-Index

[Alexander Klein]

Hi List,

How can I use a Servlet as the "page" that a visitor gets when he visits my domain 
directly.
eg. When a user enters http://www.test.de then he should get the output of my 
servlet.Is this possible ? 
and if so, how ?
I am using Apache and Tomcat 3.2.1

Thanky, 
Puck