He resides somewhere in Washington, but if you wear your glasses right, you know he is pretty much everywhere.
He is probably part of your computer's operating system, or your web browser. He might even be in your swank ol' HTC cellphone. He's probably even with you right now, as you read this. He is present here, as I write this down.
But now, he'll be everywhere but at Microsoft. He sort of retires, today.
His name is William, but you call him Bill.