[racket] what does warp-pointer do?

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Hi list,

in the docs[1] the canvas-method warp-pointer is described as moving
the cursor to the given location. What is this cursor/pointer that is
mentioned? Is this supposed to aid relative drawing (doesn't seem so)
or is it supposed to change the keyboard- or mouse-focus? Or something
else entirely?

Marijn

[1]:http://docs.racket-lang.org/gui/canvas___.html#%28meth._%28%28%28lib._mred/main..rkt%29._canvas~3c~25~3e%29._warp-pointer%29%29
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