Tammy Worcester explains how this can be used here: http://www.tammyworcester.com/TipOfWeek/TammyWTechTipOfWeek/Entries/2009/8/25_Tip_72_-_Block_Posters.html Basically, it allows you to easily resize any picture in your PC to turn it into a class poster, and print it at home using ordinary sheets. 8-)