Use QR Codes to direct students to websites, videos, and audio files when it is difficult to type a web address. For instance, here is the QR Code for Infinitec.
Download the app, i-nigma to the iPad, open it and hold it over the QR Code. Once it reads the code, you will be directed to the URL embedded in the code. Go to this wiki for more information about QR Codes. They have marvelous uses, including linking to audio files that speak the text in a book, a worksheet, or instructions. They can link to social stories, to videos demonstrating the steps of a task or to websites you want the students to go to.