System.desktopLeft

Function/Meaning
Desktop left edge position
Type
System class property (read-only)
Description
Represents the left edge position of the desktop (the area where windows can be displayed) in pixels.
The value is for the display where the main window is located.
If there is no main window, the primary display is targeted.
Reference
System.screenWidth
System.screenHeight
System.desktopTop
System.desktopWidth
System.desktopHeight