This Web Application is intended to be used for demonstration of OnBase Feature Layer with the Esri JavaScript API. Support with Esri ArcGisRuntime is also an option, but is not shown here.
This site also demonstrates how to use the OnBase widget view model in a custom application. Meaning, you are not using the standard widget deployment (no custom development) using Esri Web AppBuilder, Geocortex, or CityWorks. If you own/use CityWorks, Geocortex, or Esri Web AppBuidler, it is highly recommended those be used instead.