About Messages and Message Queues

Unlike traditional applications, applications written for Microsoft® Windows® are event-driven. They do not make explicit function calls (such as C run-time library calls) to obtain input. Instead, they wait for Windows to pass input to them.

Windows passes all input for an application to the various windows in the application. Each window has a function, called a window procedure, that Windows calls whenever it has input for the window. The window procedure processes the input and returns control to Windows. For more information about window procedures, see Window Procedures.

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