Sharing session between webapps

[Aymeric Alibert]

Hi,
 
I have two web applications running on the same Tomcat server. One is used for 
administration (webapp1) of the other one (webapp2). I would like my administration 
application to be able to set some session values in 'webapp2' and then redirect to 
'webapp2'. The goal is to bypass the login page by directly setting-up the userid.
Is there any way to share sessions information between app?
Any other suggestion?
 
Thanks,
 
Aymeric.