Overview
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Fire the event, telling which class, object and variable has be changed. The parameter may be NULL in order to indicate that a larger set has changed. E.g. _pVar=NULL means, that the object as a whole has changed. If also _pObject=NULL, the whole class or a couple of objects changed. If even _pClass=NULL, the entire library may have been changed and applications better should Refresh() all objects in use.