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Chapter 21. Understanding Event Processi... > Access as a Windows Event-Driven App...

Access as a Windows Event-Driven Application

If you’re reading this book, you’re using Microsoft Office and Microsoft Windows. You probably use Windows every day and don’t give a second thought to how it actually works. Understanding Windows is essential to programming events in Microsoft Access.

Understanding Events in Windows

Microsoft Windows is an event-driven and message-based operating system. When you start an application on your system, that application sends messages to Windows to tell Windows that it wants to respond to certain events. When an event occurs (such as moving your mouse over the application window or clicking somewhere), Windows sends a message to the application to notify it that the event happened. The message usually includes critical information, such as the location of the mouse pointer when the event occurred. The application then responds to the event—usually by sending a message back to Windows to act upon the event. Figure 21-1 shows you a conceptual view of this process.


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