extends OpenCAGE.Dialogs.Handlers.Handler_Target
This is called by an event handler if an event occured (You guessed that. This description is very abstract, because the class is also very abstract). [This description is adopted from 'OpenCAGE.Dialogs.Handlers.Handler_Target'.]
returns true if a (button) event with the given link string will be handeled. This can be used to gray out the buttons if they shouldn't be used. [This description is adopted from 'OpenCAGE.Dialogs.Handlers.Handler_Target'.]