This [Tcllib] package provides the hook ensemble command, which implements the Subject/Observer pattern. It allows subjects, which may be modules, objects, widgets, and so forth, to synchronously call hooks which may be bound to an arbitrary number of subscribers, called observers.  A subject may call any number of distinct hooks, and any number of observers can bind callbacks to a particular hook called by a particular subject.  Hook bindings can be queried and deleted.

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