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7.1.4 The GHOSTVIEW environment variable

parameters
window-id [pixmap-id]
scanf format
"%d %d"

Explanation of parameters:

window-id
tells ghostscript where to If pixmap-id is not present, ghostscript will draw on this window.
pixmap-id
If present, tells ghostscript that a pixmap will be used as the final destination for drawing. The window will not be touched for drawing purposes.