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erase [, window, x, y, w, h] [,
/dev, /dvi, /img, /plt, /rim, /rpl] [, /screen, /postscript]
Erases (part of) a LUX window (if /screen is specified or
!pdev is equal to zero), or starts a new page in the Postscript
output file with name !ps_file (if /postscript is
specified or !pdev is equal to 1).
If the action is in the Postscript file, then all other arguments are
ignored. Otherwise, the erasure occurs in window window
(defaults to !window – commonly the last used window) and is
optionally restricted to the window part starting at coordinates
(x, y) with width w and height
h, all measured in the coordinate system indicated by the
keywords, or in dev coordinated by default.
See also: Screen Coordinates, !pdev, !window, !ps_file