Options to allow the host to use auto-generated global-ID and register to viewer/console via FQDN so viewer can be hosted outside of local network, yet, the host can find the viewer. Also, if host is installed with "group/site? switch, it will be placed in the correct site.
Right now the Host can automatically "call back" the Viewer by its IP address or DNS name, if you set up a call back connection (see Callback connection). Is that what you mean or do you mean something else?