Differences Between IIS 6 and IIS 7+
The concepts in both IIS versions are generally the same with the exception of WAS (Windows Process Activation Server) introduced in IIS 7+. With reference to the following diagrams, the class/ object denoted in Green (Http.sys) runs in Kernel mode while the rest run in User mode. IIS 6 The concepts are denoted in the following UML Class diagram: The delegation model is captured in the following UML Sequence diagram: IIS 7 The concepts are denoted in the following UML Class diagram: The delegation model is captured in the following UML Sequence diagram: