Interfaces can have hierarchies. For example, the IADsComputer interface inherits from the IADs interface. This means that all properties and methods of IADs automatically apply to IADsComputer. If you look at the help for IADsComputer, you will see a list of methods and properties for this interface. These are specific to the IADsComputer interface. You should also look at the help for the IADs interface since these too apply to IADsComputer.