Plan 9 from Bell Labs’s /usr/web/sources/patch/applied/vncv-curtrail/readme

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When using vncv on a terminal with software cursor (vesa, rpi) the
mouse cursor leaves a trail.  This seem to be caused by the fact that
vncv loads picture updates with loadimage(2) directly to screen.
Loading to an offscreen image followed by a draw(2) to screen removes
the artifact.

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