The Amiga graphic environment consists of 1 or more screens containing zero or more windows. A screen typically fills the entire computer monitor (though this is not necessary) and contains information like:
Each window on the screen inherits these properties.
While many other GUI's support multiple windows, they traditionally have only 1 screen. On the Amiga, multiple screens may be displayed simultaneously, each with its own depth, resolution, colors, etc. Like windows, screens may be dragged and shuffled in front/back of each other.
Applications may designate their screens as private or public. A public screen permits other applications to open their windows on it, giving the user the power to construct multiple work environments.