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Chapter 4. A Brief History of Legacy .NE... > .NET Enterprise Services
4.2. .NET Enterprise Services
It All Began with COM (and DCOM)
COM helped encapsulate object-oriented systems into binary components. It supported encapsulation by preventing leakage of implementation details, and logic encapsulated in COM components could only be accessed if it had been exposed via a public interface. DCOM extended COM to enable communication across different computers, as shown in Figure 4.3.
Figure 4.3. DCOM extended COM by allowing COM components to communicate across physical boundaries.
