ArcGIS API for Microsoft Silverlight/WPF
Create rich Internet and desktop applications.
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Try these live, interactive demos to see how easily you can build rich mapping Web applications with software and tools from the EDN subscription.
Flex Viewer [Flash 10 Required]
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This sample application uses the ArcGIS API for Flex to combine mapping and spatial analysis capabilities from ArcGIS Online and ArcGIS Server.

Site Selection and Trade Area Analysis
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This application uses the ArcGIS API for JavaScript to combine spatial analysis capabilities from ArcGIS Server with basemaps from ArcGIS Online to help users analyze potential business locations.

Parcel Owner Notification List
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This application uses the ArcGIS API for JavaScript to combine spatial analysis capabilities from ArcGIS Server with local government data to create a mailing list of specific property owners.

These videos provide you with the basic concepts of ArcGIS Server and how you can use it to disseminate GIS-enabled content on the Web.
Introduction to ArcGIS Server
Get an overview of why people use ArcGIS Server, the benefits of delivering centrally managed GIS, and what client applications and extensions are available with ArcGIS Server.
View demo: Flash [05:44] | Windows Media [05:44]
Introduction to ArcGIS Engine
Get an overview of how you can use ArcGIS Engine to deliver custom GIS and mapping applications.
View demo: Flash