How will the portal handle the distribution of data across the globe i.e. will "mirror sites" be supported or can you describe how content will be synchronized/mirrorred across physical sites?
Portal software itself does not do data replication/mirroring. It is left to your website topologies (network/hardware/business model) to do such replication and route requests to the corresponding web site running the portal software.
Portal Software can, however, aggregate and do federated searched across several information sources but do not replicate/synchronize.
This was first published in June 2002