When this occurs on a single monitor, moving the cursor past the right or left edge of the monitor will cause the second screen to appear on that monitor instead of the first. For example, one display might use two screens to display a very wide Mercator map of the world. This could be accomplished using one monitor or two. Title bars and icons are functions of the Window Manager. For different clients, activity within each window proceeds independently of activity in other windows.
Some clients have multiple windows that interact with each other.
With the exception of some paginators, windows can be moved and resized without affecting the execution of their clients. Overlapping windows do not affect each other. One special window is the root window, which forms the background of the display. Inside the root window you can perform window management functions rather than ordinary input and output with a window. Windows can also be represented by icons.