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The SystemInformation.VirtualScreen property indicates the bounds of the entire desktop on a multi-monitor system. You can use this property to determine the maximum visual space available on a system that has multiple monitors installed.
The position coordinates of the rectangle indicate the position offset, in pixels, of the upper left corner of the virtual screen area relative to the upper left corner of the onscreen area of the primary display. The size values of the rectangle indicate the size of the virtual screen area.
The System.Drawing.Rectangle.X position coordinate of the rectangle is negative when the virtual screen starts to the left of the left edge of the primary display. The System.Drawing.Rectangle.Y coordinate of the rectangle is negative when the virtual screen starts above the top edge of the primary display.
This property is supported only on Windows 98, Windows Millennium Edition, Windows 2000, Windows XP, and the Windows Server 2003 family.