!!! Dynamically Linked Auxiliary Classes [1]

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[{$pagename}] has information that is is specific to [Microsoft Active Directory]!
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Similar to structural and abstract object classes, auxiliary classes are defined by a classSchema object in the Active Directory schema. For more information, see [Structural ObjectClass], Abstract, and [Auxiliary ObjectClass|AUXILIARY]. This schema definition specifies various characteristics of the class, including the attributes associated with the class.

Unlike with structural classes, You cannot create an instance of an auxiliary class as you can with a structural class. Instead, you use an auxiliary class to extend the list of attributes that is associated with another structural, abstract, or auxiliary object class.

[{$pagename}] is a class that is attached to an individual entry, rather than to an [objectClass]. Dynamic linking enables you to store additional attributes with an individual entry without the forest-wide impact of extending the schema definition for an entire [objectClass]. 

For example, an enterprise could use sales-specific [{$pagename}] added to various user entries of its sales people, and other department-specific auxiliary classes to the user objects of employees in other departments.

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Do confuse [{$pagename}], which behaves more like "normal" [Auxiliary ObjectClass|AUXILIARY], with Microsoft's [Statically Linked Auxiliary Classes] which are quite different.
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* [#1] [From Microsoft|http://msdn.microsoft.com/en-us/library/ms676290(VS.85).aspx]
* [#2] [http://msdn.microsoft.com/en-us/library/windows/desktop/ms676289(v=vs.85).aspx] - 2013-03-10