E0_3F00 is a key on Packard Bell notebooks for social networking which producer describe as:
Integrated social networking
Don't miss a thing! A special integrated social networking application connects you to three of the most popular services at the same time with a one-touch button. Stay in touch and connect with your friends on Facebook, watch and share videos on YouTube™,
and upload your picture collection to show everyone on Flicker. Updated in real-time, you can always keep in touch and share with the world!