how workflow engine works

Can somebody guide me how a workflow engine works which can be integrated with visual studio.net 2003.

Please refer me some website where i can get some sample application built on this.

Also recommend some workflow engines for .net.

One more question, can workflow created in biztalk be integrated in a .net application as a business layer component and is it open for change at runtime to implement the changes on the fly

regards

bhaskar



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how workflow engine works