Use this tag when ArcGIS Desktop is the product and architecture that you are using from the ArcGIS platform.

Questions that relate to the functionality and use of the ArcGIS Desktop product and architecture. If you are using the new ArcGIS Pro architecture/application then tag with instead.

Guidelines for how to tag questions on ArcGIS Desktop (and other products from the ArcGIS platform) are available in an extensive Meta Q&A:

Tagging ArcGIS questions?