Record a screencast and then edit it. The key is not merely to record pixels but logical objects on the screen: windows, text, desktop background, etc. The recording program must interact with the window manager. Editing operations afterward can edit those objects logically instead of having to detect borders. Moving an object requires having recorded what was underneath.
For example, remove the instant messenger notification that popped up during recording.
Consider distributing the recording encoded logically rather than flattened out into pixels. The viewer can adjust things. Blue sky: the viewer watches the screencast on a display of different aspect ratio than was recorded, so window sizes are adjusted and content reflowed. It seems the viewer's video player and the applications on the recorder's computer must interface.
Others have noted that screencasts are critically important for disseminating information.
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