Trim & Extend Multiple Objects

In earlier versions of AutoCAD, the default selection method for trimming and extending was to pick one object at a time to modify. Now, however, you can "window" around multiple objects and they will all trim or extend at once. (The only caveat is if you select two segments of a polyline with one window, only one segment will trim.) The FENCE option is still there, too, in case the objects don't lend themselves to being selected with a window.