What is window class?
Each window in Microsoft Windows operating system has some properties or, in other words, belongs to some registered class. ActiveTextBox knows what textboxes to use basing on a textbox class. ActiveTextBox remembers most classes that textboxes have. When you create a new ActiveTextBox item the cursor changes its shape and color. But some applications might have textboxes with different class names. To add ActiveTextBox item to such a textbox you must add its class name to ActiveTextBox database. The class name of a window that is under mouse cursor is shown in New ActiveTextBox window. You can register new class by either pressing Register Class button or choosing Classes list in Edit menu.
