Employee entrance only. 1. Where do you usually find this notice? 2. What is meaning of this notice? 3. Who is the notice addressed to?

1. we can find this notice at the office.
2. we are not allowed to entrance the room, only the employee of that office can entrance the room.
3. the notice addressed to all people except the employee. 

I hope my asnwers can help you:))

1. A mall or store
2. We're not allowed to enter the room except the employee
3. Us or the visitors