The ReservedSystemPaletteEntries property indicates the current number of reserved entries in a system's color table. The ...

The ReservedSystemPaletteEntries property indicates the current number of reserved entries in a system's color table. The operating system may reserve entries to support standard colors for task bars and other desktop display items. If the system is not using a palette, then ReservedSystemPaletteEntries is null.

Example: 24.