Load / Save
Configuration File - Reload Allows you to load a configuration file saved from this, or another viewer.
Configuration File - Save
Allows you to save the current settings so that they can be copied from one viewer to another.
Configuration File - Save As...
Allows you to save the current settings under a new name so that they can be copied from one viewer to another.
Defaults - Reload
When clicked, all connection options are returned to the default settings that are currently saved.
Defaults - Save
When clicked, saves the current connection options as the default set that will be used in all subsequent VNC connections.