I'm using Windows XP. I can't tell my application to feed paper from the lower tray.
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Click Start => Printers and Faxes, and right click the appropriate driver. Select Properties.
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Click on the Device Settings tab.
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Change the Lower Paper Tray setting in the Installable Options area from OFF to ON.
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Select the paper size from the Lower Paper Tray setting.
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Click Apply and then click OK.