ScreenGrabber is the name of a relocatable module that allows you to take multiple pictures of the screen display, even when you are running a single-tasking application (such as a game or graphical demo). The screen display is saved as a Sprite file, optionally with the current palette. The snapshots are numbered, so you can take as many as you like without overwriting the previous picture.

A desktop front-end application allows easy configuration of settings such as whether the 'hot' key is enabled, the current save location and base filename, and whether or not to include the palette.
Short animated sequence constructed from a series of Star Fighter 3000 screenshots

If you have more hard disc space than sense, then making animations is fun. Continuous recording can be synchronised automatically with screenbuffer swaps, or with a fixed delay period between frames. You can then convert the numbered screenshots into an animated GIF using Peter Hartley's InterGif.