Printing from an iPod, iPad or iPhone
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I use it to connect to my HP all in one printer which happens to be connected to my network via ethernet, but this is not necessary for AirPrint Activator to work. Obviously your computer needs to be on and AirPrint Activator loaded. Unlike with the real AirPrint, the iOS device does not connect directly with the printer.
However this would not solve the problem for someone who has an iPad and a printer, but no computer.