Differences in the Client Architecture Between High Interactivity and Siebel Open UI
The following figure compares the ActiveX UI architecture that the old high interactivity client used to the architecture that Siebel Open UI uses.

As shown in this figure, things to note when comparing the client architecture between high interactivity and Siebel Open UI include the following:
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Client Environment. The Siebel Open UI client environment allows you to customize run-time configurable objects to meet a wide range of rendering requirements, from supporting more than one Web browser type to deploying to various client form factors.
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Style sheets. The Siebel application or Application Interface serves static style sheets.
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Object Definition Html. The Siebel application serves dynamic Object Definition Htmls.