xev creates a window and then asks the X server
to send it notices called ``events'' whenever anything
happens to the window (such as being moved, resized,
typed in, clicked in, etc.). It is useful for seeing what causes
events to occur and to display the information that they contain.
Options
-displaydisplay
This option specifies the X server to contact.
-geometrygeom
This option specifies the size and/or location of the window.