The links below will provide you with help documentation for use with ArcGIS Explorer Desktop and the ArcGIS Explorer Desktop SDK for the Microsoft .NET Framework. There has been no change to the help documentation since ArcGIS Explorer Desktop build 1700.
ArcGIS Explorer Desktop Help
English | Simplified Chinese | French | German | Japanese | Spanish
ArcGIS Explorer Desktop SDK Help
ArcGIS Explorer Desktop SDK Component Help
ArcGIS Explorer Desktop SDK Conceptual Help and Samples