Use this tag when ArcGIS Desktop is the product you are using but also tag for the application (ArcGIS Pro or ArcMap) that you are using.
Questions that relate to the functionality and use of the ArcGIS Desktop product.
Also tag with whichever of the ArcGIS Pro/ArcMap/ArcCatalog/ArcGlobe/ArcScene applications you are using: arcgis-pro/arcmap/arccatalog/arcglobe/arcscene.
Guidelines for how to tag questions on ArcGIS Desktop (and other products from the ArcGIS platform) are available in an extensive Meta Q&A:
http://meta.gis.stackexchange.com/questions/3131/using-tags-on-arcgis-questions
