I need help regarding event generation from web browser

I need to start one client program as soon the User presses "Login" button through the browser.

i.e I want to generate an event to run my client application that can be a web start application ,

Can I do it without any intervention of the user.

Plz give me the idea. Is web browser and Web start integrate with each other . I am new to this technology.

Thanks in advance

[401 byte] By [kapessa] at [2007-11-27 4:45:56]