PCNS and SSPR between 2 forests

Hi,

We have a requirement to have the same users in 2 separate forests, Forest A and Forest B. So users from Forest A are also created in Forest B via FIM.

FIM Sync, Portal and SSPR is deployed in Forest A.

Users log unto workstation in Forest B, where they need to be able to change their passwords, using the traditional cntrl-alt-del routine; these passwords need to be replicated to Forest A.

Additionally users in Forest B must be able to reset their passwords using the FIM add-ins and extensions, as well as via the SSPR Portal which is hosted in Forest A. So effectively, password changes in Forest A must also be replicated to Forest B.

Since PCNS is unidirectional - is the above actually possible?

thanks,

DW