DCOM is an extension of Microsoft's COM (Component Object Model).
COM adopted the structure of C++ virtual function tables as the binary representation of an interface. COM interfaces are presented to clients as pointers to virtual tables.
The COM server can create object instances of multiple object classes.
DCOM has extended this interprocess communication across the network.

DCOM History
starting in 1990 with Object Linking and Embedding (OLE).
OLE was later extended to OLE2 with the introduction of Microsoft’s Component Object Model (COM) to provide inter-application communication and document embedding across Microsoft applications.

Distributed COM (DCOM) emerged to address COM’s shortcomings in supporting remote components.

DCOM Architecture


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