U3 basically enables the user to run programs that have U3 capability (e.g. firefox) straight from your Sandisk cruzer, without having to install it on your computer.
Step 1: Materials
Things you will need:
1. A Sandisk cruzer micro (I'm not sure how to do it on any other device as this is the only one i have)
2. A. Computer
3. Access to the internet.