Sessions across multiple apps, same domain

I'm fairly new to cake, but an experienced PHP developer. I have a
production setup of cake. It looks as follows:

/home/keven/cake1.3 - This contains the 'spark_plug' plugin, which
handles authentication
/home/keven/app1
/home/keven/app2

Webroot is located here:

/var/www/login
/var/www/contest
/var/www/game

The idea is that a user logs in, then goes to another app where their
login details are supposed to be kept within session data or the $user
object from spark plug plugin.

The problem is that sessions are not being passed app to app. I've
even tried to set a session explicitly in one app and tried to read it
in another and it is blank. (ie, first app: $_SESSION['try'] = 'this'
-- second app: print $_SESSION['try'];

Any ideas would be greatly appreciated. Thanks in advance everyone

----------------------------------------------------------------------------------------------------------------------------

More about my setup:

Cake 1.3.2
Configure::write('Session.checkAgent', false);
Configure::write('Security.level', 'medium'); *** I've also tried
'low'
Configure::write('Security.salt',
'LKJd2ou43kljLKDJfkljueoiru34asdfk3'); *** this is the same across all
apps

I've read the following articles to no avail:

http://bakery.cakephp.org/articles/view/how-to-bend-cakephp-s-session-handling-to-your-needs
http://www.amityadav.name/cakephp-sharing-sessions-between-apps-on-the-same-domain

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