The function screen-monitor-geometries
returns the geometries of all the monitors of screen. A monitor corresponds to an entity that the host machine regards as a physical monitor. screen-monitor-geometries
ignores software manipulations like the desktop on GTK+.
The monitor geometry is a rectangle which includes all of its display area, including "system areas" like menubar and taskbar and so on. Examples of these include the Windows taskbar, the Mac OS X menu bar and the Mac OS X Dock.
Each monitor geometry screen rectangle is represented by a list of four numbers: the x and y coordinates as offsets from the top-left of the primary monitor, and the width and height .
The first screen rectangle in the monitor-geometries list corresponds to the primary monitor.
screen-monitor-geometries
differs from screen-internal-geometries by returning screen rectangles which include all the monitor areas, and also by ignoring desktop manipulations.
pane-screen-internal-geometry
screen-internal-geometries
virtual-screen-geometry
Screens
Support for multiple monitors
Querying and modifying interface geometry
CAPI User Guide and Reference Manual (Unix version) - 3 Aug 2017