It's true that all tabs in the browser share the same HTTP session and Seam's identity.
However you can get a different session and a separate Seam's identity opening the new tab with the privacy mode of the new Google Chrome browser.
The same functionality should came in the upcoming Firefox 3.1 too, but I don't tried yet.
Stefano, thank you for the idea, but It would be great to have it browser-independent. I've using Oracle ADF faces for last four years and thought Seam will fix some limitations.
Looks like I have to create custom
identityobject to keep user's identity in the conversation, not in the
Identityobject, but in this case I cannot use Seam to control access to pages.
It's not a really big deal for my application to have separated user sessions, but nice to have feature, so I'll keep trying to find some workaround.