This book provides a concise guide to the kind of customization programmers can achieve with AutoCAD 2006. It demonstrates how to use AutoCAD through short code examples wr- ten in Visual Basic for Applications (VBA). It also includes a complete quick reference that lists all the events, methods, and properties available with AutoCAD. Finally, it describes all the constants and system variables. What Is AutoCAD? So, what is AutoCAD? First released in 1982 under the name MicroCAD, AutoCAD has become a powerful tool for drafting and design purposes. AutoCAD 2006 incorporates many new features to enhance flexibility and drawing control. To reflect this extra functionality, many new ActiveX objects, properties, methods, and events have been included for improved programmability. What Is This Book About? This book is about AutoCAD 2006 and how to use AutoCAD VBA in your applications to h- dle all your drawing tasks more efficiently. It shows you how to programmatically control the creation and editing of individual drawing objects, manipulate linetypes and layers, control text and dimension styles, and do much more. As you encounter each of these topics, you?ll learn all about the associated objects, including their properties, methods, and events. By interfacing with AutoCAD, you can exploit all of AutoCAD?s functionality that would have taken you a long time to write yourself. This book will first help you learn how to use this functionality. Then it will become a handy reference later, when you have a question that you just can?t answer.