A federated portal network (FPN) allows organizations with multiple portals, SAP and non-SAP, to share content between the portals. By implementing a federated portal network and sharing content between portals, organizations can provide users at each location with a single portal access point. From each portal configured as an access point, the users are able to access information, services and applications distributed on portals throughout the entire organizational network.
A list of the FPN FAQs is maintained else where on SDN You can get to them from here: FPN FAQs