| Class | CookieError | Undocumented |
| Class | ICookieFile | No class docstring; 3/3 methods documented |
| Class | IApplicationDescriptions | Get a list of application names, useful for launcher programs |
| Class | IXMLRPCService | No class docstring; 3/3 methods documented |
| Class | ISystemNotifier | Undocumented |
| Class | IPluginManager | Undocumented |
| Class | IPlugin | Undocumented |
| Class | IPaymentOperation | An object implementing IPaymentOperation is a 1:1 |
| Class | IPaymentOperationManager | This is a singleton for storing payment |