URL parameters can be used to pass along additional information or instructions to many ArcGIS Instant Apps. For example, you can zoom an app to a specific location, zoom in to a specific scale level, find a location, configure a pop-up, and more.
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This updated blog article shows various URL parameters that you can use, and also includes step-wise instructions for creating custom URL parameters in Instant Apps.
For more information, see Use URL parameters in ArcGIS Instant Apps.