| FeDetector | This generic superclass for detectors is so the comm system can tell what things are detectors. |
| FeFillDetector | Client defines subclasses and passes in an instance in order to be notified of new results from Edit... |
| FeFillRangeDetector | Client defines a subclass and passes it in to Edition::addFillRangeDetector, to be notified whenever... |
| FeRevisionDetector | Client defines subclasses and passes in an instance in order to be notified of revisions to a Work |
| FeStatusDetector | Is notified of changes in the capability of a Work object. |
| FeWaitDetector | Will get sent a single message, once, with no parameters, when something happens. It can be passed i... |