To add or move workstations or applications in an APPN network, no coordinated LU definitions are required. As workstations and applications first become available or are later moved, APPN directory functions can locate them dynamically. If new hosts are added, only the resources on that host must be defined to that host.

If an APPN network node is to be moved from one APPN subnetwork to another, purge its topology database before activating CP-CP sessions in the new APPN subnetwork. This prevents broadcasting of network topology from the original subnetwork to the new subnetwork, information that is of no use in the new subnetwork. For a description of APPN subnetworks, see APPN multiple network connectivity.

No definitions are necessary in the subarea network for resources added or moved in the APPN network. APPN directory functions can locate them dynamically.