STEP 9: Serializing objects

Every object having his class definition stored in a versionned source code file (so, not defined in .INC files) must be serialized and stored under a property of the session object, being an array of serialized objects. This is needed because if you register directly these objects as session variable, then at the next fly execution, the 'session start' statement will try to 're-life' these objects without having their class definition available (because stored inside source code document objects or library that have not yet been 're-life' themself.