integrating apps (forum,chat) inside portlets

[Fabien COPPENS]

Hi all.
A question from a very new user :
how would you evaluate the difficulty of integrating external
open-source
applications such as Jive forum or jzchat as portlets inside Jetspeed ?
The above apps have their own way of managing their users and
authentication
with their own DB model. How can one get a portal with these
apps seamlessly integrated ?
Thanks.
 
Fabien