The ReservedSystemPaletteEntries property indicates the current number of color index entries reserved for system use. This ...

The ReservedSystemPaletteEntries property indicates the current number of color index entries reserved for system use. This value is only valid for display settings that use an indexed palette. Indexed palettes are not used for color depths greater than 8 bits per pixel. If the color depth is more than 8 bits per pixel, this value is set to NULL.
Example: 20  
This property has been deprecated in favor of a corresponding property(s) contained in the Win32_VideoController, Win32_DesktopMonitor and//or CIM_VideoControllerResolution