What has two banks but no money?

I only use two letters of the alphabet.
I can be vast or fairly small.
Many call me home.
Others only come to visit.
Question:  What am I?

I stare at you, you stare at me.
I have three eyes, yet I cannot see.
Every time I blink, I give commands.
You do as you are told with your feet and hands.
Question:  What am I?