The "FullName" of a Command should be:

• The .Source of an External Script or Application, if no .Root is set
• The relative path of an ExternalScript or Application, if .Root is set (and the path is beneath root)
• the Module qualified name of any other command in a module
• The .ImplementingType.Namespace + '.' + .Name of any [CmdletInfo] not in a module
• or the command name.