The Widget Scope is a tool that reveals objects "behind the scenes" of an interactive Smalltalk application.
A user simply clicks anywhere on the screen, and the Widget Scope lists the widget objects that produce that part of the display, as well as other objects that implement the function provided by the application.
Widget scoping in conjunction with visualizing and snooping (pages "The Object Visualizer" and "The Snooper"), constitutes an extremely powerful, yet practical and convenient, means of "getting to the bottom" of behavior of unfamiliar applications and frameworks.
Without these tools, a programmer trying to gain an understanding of how an application works (to fix it, to extend it, or to reuse parts of it) is faced with roundabout schemes involving searching for classes by pattern matching on their names, guessing at how to launch an application, and trying to get a debugger to open at opportune times.