How change the first page in Windchill?

Hi all.

I want everything to work in such a scenario:

1. User login to Windchill in browser.
2. Windcill redirect user on page as example, http://server/Windchill/message.jsp
3. After user click ok jsp button on page message, he rederect to the page from last session.

Message was extracted from windchill database via java API, from forum topic object.

How I can change first page on http://server/Windchill/message.jsp?

THANKS!