When a program crashes or hangs on modern Windows, it still paints ghost windows like in XP or earlier - they've simply become invisible. This error actually still exists in post-Windows Vista versions of the OS, but Microsoft introduced a "trick" to hide the worming effect. As such, it simply repeats the last known visual representation of the window repeatedly, creating these worm-like trails across your screen, overlapping on previous instances. With the window crashed, it can no longer respond to messages to remove its previous "painted" position. When you drag a window in older versions of Windows, each mouse drag motion would essentially delete and re-paint the graphics of each window in a new place. When a program (or " app", to you youngsters) got stuck, it would no longer be able to respond to requests from the operating system to "paint" the repositioned windows in new locations. It occurred as a result of an odd interaction with older Windows version's GUI rendering, and when a program had crashed. These glitches are called "ghost windows" internally, previously explained by Raymond Chen at the now-defunct Channel 9 Microsoft dev site. Head over to to give the classic Windows error "worm" trail glitch a workout.
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