Apple devices, like the iPhone, iPad, and iTouch have an Unique Device Identifier (UDID), which is a sequence of 40 letters and numbers specific to the device. The UDID works like a serial number, a very difficult to guess serial number.
We all remember when the Internet ran on Flash. It was exciting, it was interactive, it made us forget that the colors and sounds we were presented with were ultimately the same ones and zeroes of script compilers and logic engines. Flash gave art a seat at the web design table as well as expanding the functions of what a website could do.