Distinguish between an in-bound and out-bound interface?

In-bound calls are coming from client and goes to server. Client calls interface functions and these are in-bound calls and the interface is called in-bound interface. ISendMessage, IUnknown, IConnectionPointContainer, IConnectionPoint, are all inbound interfaces to the server in the below server.

Out-bound calls are made by server to the client. It is the call which goes opposite side and often known as events and callbacks. Server uses out-bound interface or a sink interface to call these events and callbacks. In the above server IReceiveMessage is an outbound interface or sink interface. Server can send back messages to the client by this interface.

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