The GHOSTVIEW property - GNU gv Manual

type: STRING
parameters: bpixmap orient llx lly urx ury xdpi ydpi [left bottom top right]
scanf format: "%d %d %d %d %d %d %f %f %d %d %d %d"

Explanation of parameters:

pixmap: pixmap id of the backing pixmap for the window. If no pixmap is to be used, this parameter should be zero. This parameter must be zero when drawing on a pixmap.
orient: orientation of the page. The number represents clockwise rotation of the paper in degrees. Permitted values are 0, 90, 180, 270.
llx, lly, urx, ury: Bounding box of the drawable. The bounding box is specified in PostScript points in default user coordinates.
xdpi, ydpi: Resolution of window. (This can be derived from the other parameters, but not without roundoff error. These values are included to avoid this error.)
left, bottom, top, right (optional): Margins around the window. The margins extend the imageable area beyond the boundaries of the window. This is primarily used for popup zoom windows. I have encountered several instances of PostScript programs that position themselves with respect to the imageable area. The margins are specified in PostScript points. If omitted, the margins are assumed to be 0.