ABSTRACT
The input system discussed thus far is based on the operator selecting objects from the drawing, typing data, or interacting with a dialog box. But AutoCAD has much more: menus across the top, sidebar menus, pop-up menus, toolbar icons, the text screen, and the graphics display. Each can be controlled by Visual LISP programs. In addition, operating-system-level interfaces are provided because AutoCAD runs in a Windows environment. Visual LISP programmers can exploit ActiveX automation tools from other environments. This provides plenty of power for even the most demanding applications.
