What you mean by COM and DCOM?

• COM component object model
  COM is a Specification defined by microsoft in order enhance the productibility of one application in to other.COM is a FrameWork which when implemented both the application can talk each other.COM is set of rules and it is language independent. COM talk about Language interability. and reusablility.
  
  Dcom distributed component model
  This will use RPC mechanism for communication,DCOM had to solve the problems of
  
  
  - serializing and deserializing the arguments and return values of method calls "over the wire".
  
  - ensuring that references held by clients of interfaces are released when, for example, the client process crashed, or the network connection was lost.
  
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