Using COM+ Components
COM+ is the Component Services layer in Windows 2000 and later operating systems. It supplies a number of services to components running under Windows, such as
Object pooling and just-in-time activation
Queued components for asynchronous calls
A publish-and-subscribe events model
The Type Library Importer tool and Visual Studio .NET can both create wrappers for COM+ components using the same procedures they use for COM components.