If this IDO uses a custom assembly (that is, a custom method not stored in the application database), select the assembly name from the list. These assemblies are defined in the IDO Custom Assemblies form. Specifying the name here associates this IDO with a .Net extension class code in a custom assembly. Specify the extension class in the Ext Class Name field, and its .Net namespace in the Ext Class Namespace field. Custom assemblies contain the app server code for Mongoose applications. For more information about custom assemblies and extension classes, see the IDO Development Guide.