Architecture description languages (ADLs) are used to specify and analyze the composition of a software system. Traditionally, ADLS are used at the specification and design stages of the software development lifecycle. Recent developments in component-based middleware has seen the rise of configuration-oriented software development. Here, we bring ADL ideas to the world of component configuration, in the context of Microsoft's COM+ and .NET. We describe an approach to and tool for configuration of .NET components in the COM+ middleware. We consider configurations of systems built using the .NET/COM+ middleware, and architectural descriptions designed using the UML profile for enterprise distributed object computing (EDOC).