Method XbpPrinter():setDuplexMode() Foundation
Sets or retrieves the mode for duplex printing
:setDuplexMode( [<nMode>] ) --> nDuplexModeOld | NIL
|do not print double-sided
|arrange output "side-by-side"
|arrange output "top-down"
The method returns the previous setting or NIL, if the printer does not support double-sided printing.
If print output is to appear on both sides of a sheet of paper, duplex mode must be turned on. The print output can be arranged depending on how a page is turned, either from left to right, or from bottom to top.
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