If you want to use Tomcat product to create a web access to BIM you need to know following points:
To install Tomcat you need to dowload pakckage from http://tomcat.apache.org
Read RUNNING.txt file included int the Tomcat package and follow all steps.
You need to use Java Development Kit (JDK) version 1.4.x or later.
To download the package use that following links http://java.sun.com/javase/downloads/index.jsp
Install JDK on your server too.
Existing in BMC Software documentation for BIM 6.2.01 but not in 6.1.03 you need to copy tools.jar
file fom JDKHome/lib