

For printers that support it - as many HP models do - you'll download and launch apps on the printer's color screen. You might not know it, but your computer printer might be capable of running apps on the printer itself. Try Readdle's Printer Pro (for iOS $6.99), or download a program like OPrint (for Windows free to try, $19.80 to buy) or handyPrint (for Mac free) that serves as a middleman between your iDevice and your printer.

Here's the good news: There are downloadable programs that trick your iOS device into thinking any printer connected to your computer is AirPrint-compatible. While millions own an iOS device - iPhone, iPad or iPod touch - only a handful of printers are AirPrint-compatible.
HANDYPRINT ALTERNATE MAC OSX
Imagine taking the train to work and having the print job done before you step in the door? Or giving a nontech-savvy grandma a printer and emailing her photos of the kids? Similarly, some printers support cloud-based printing, via Google CloudPrint and Apple AirPrint. handyPrint, previously AirPrint Activator, is a small application that will enable AirPrint, a hidden feature to allow your shared printer to be visible on your iOS 4.2+ devices, in Mac OSX 10. Often referred to as ePrint, many printers let you set up a free email address for it, which lets you email documents or photos from any smartphone, tablet or computer in the world, and the printing will commence immediately. You're aware Wi-Fi-enabled printers let you print from within your home, but many of these printers also let you print from anywhere outside the home, too.
