Session is killed when I go to a new app, HELP!!

I use Tomcat and there I have 1 login App. But there are more webapps in the webapps dir of tomcat. I want to create a session in the login web app and then go to another web app and then check the login and pasword that I entered in the session. But when I go to another web app the Session is empty.
How can I solve this problem? Should I use sessions or maybe something else?
Pleassssssssseee can you help me?

If what you want to share among several webapps on the same server is just the login, you just have to configure the single sign on option (see http://jakarta.apache.org/tomcat/tomcat-4.1-doc/config/host.html#Single%20Sign%20On).
If you want to share more data (some kind of "server session" attributes and not only "webapp session" attribute), I think you have to manage it yourself (using a java.util.Hashtable and the javax.servlet.http.HttpSessionListener for example).
Regards.

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