About Scenes
Above there is a discussion about the option concerning how ON to the Activator Device is handled.
For a Scene we want that option not to be selected, and we would use the Activator Device only for on/off. The device table becomes the central part of how a Scene is defined. Each device can have its own settings. When the Activator Device is turned on, the Scene is Activated per the table settings. When it is turned off, the lights in the Scene are turned off.
With scenes, other Means to Activate come into play. Each Means to Activate will do the same thing as turning on the Activator Device, namely activate the lights per the table. With groups, using other Means to Activate effectively turns them into a Scene when so activated, where the Device table defines what happens upon activation. For a group, only the Activator Device can activate them as a group per se (see definition in first post above).