PCNS in multi-forest?

Hi,

Assume we have 4 forests, Forest A, Forest B, Forest C and Forest D; with a planned eventual consolidation of user from Forest A,B, C into Forest D. The 4 forests do need to run together for some time.

Forest D has FIM Sync and user accounts from Forest A,B,C have been sync'ed and created in Forest D.

Can we install PCNS on Forest A,B,C,D to sync all password changes with respective accounts in Forest D (unidirectional), even though FIM Sync is running only in Forest D?

Thanks

DW