Title: User Guide is not correct for HP 6940
Product review: I bought this accessory for my several years old HP 6940. Attaching to printer is simple. The problem is that if you follow Users Guide to enable it on Windows Vista it does not work because HP Toolbox Configuration tab does not contain any fields. Instead go to control panel, then click printer properties and go to "Device Settings" tab and change status of "Duplex printing" to "Installed". After that it works perfectly printing on both side. The only thing it pauses for about 5 second on each page before printing opposite side to let ink to dry. But it is still more convenient and much more reliable than manual two-side printing. Just start printing and go to drink coffee.
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