This can occur even if the object and client applications were written in different programming languages. ![]() Using a type library, an application or browser can determine which interfaces an object supports, and invoke an object's interface methods. ![]() Type LibraryĪ type library (.tlb) is a binary file that stores information about a COM or DCOM object's properties and methods in a form that is accessible to other applications at runtime. As with RPC client/server interfaces, a COM or DCOM object can expose its functionality in a number of different ways and through multiple interfaces. With DCOM, this access is possible regardless of whether the objects exist in the same process, different processes on the same machine, or on different machines. ![]() It forms the means by which clients can gain access to an object's methods and data. ![]() Thus, a COM or DCOM interface defines the identity and external characteristics of a COM object. Component Object Model (COM) and Distributed Component Object Model (DCOM) use Remote Procedure Calls (RPC) to enable distributed component objects to communicate with each other.
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