Manipulate a Selection Set demonstrates how to manipulate a selection set by creating a temporary red box around the limits of the combined entities. Load the LISP code and type BBS to try it out. After you specify the selection set, a red box will highlight the limits of the entities selected. Programmers will find this tip a handy example to learn from when investigating how to manipulate a selection set and how to find the limits of the set so the screen can be adjusted. The screen adjustment may be needed if your application will be adjusting the entities using AutoCAD edit commands inside LISP code. Thanks to the Wizman — and a tip of the hat from Harry!