sharing user data between several web-applications

[Felix von Delius <fv...@t-online.de>]

i need some hint for a common problem:

we're developing a portal consisting of several different web
applications (war files). Now we have the requirement to share user
data between these applications - something like a "single sign
on". we have a workaround by using cookies, but one requirement would
be not to use cookies.

is there a common solution for this, maybe some support from
struts or a struts extension?

thanks in advance!

-felix