From the Print Central Help:
EuroSmartz App Help
f your printer supports WiFi printing or you have printer sharing enabled, you should be able to print text, photos and certain documents without installing WePrint on your computer. However this method may deliver varying quality and results depending on your printer's capability.
We have developed a method of printing from the iPhone/iPad that will deliver the same consistent high quality printing output you get from your Mac or PC. By using the free WePrint helper application on your computer you will be able to print ALL document types, to ANY printer available to your Mac or PC, at the very best quality.
We believe it is vital that our customers have the freedom to print emails, Office documents, Pages and the many other document formats that you can already print on your computer and this is the way to do that.