fl (ULONG)

Desktop background state indicators or setting options.

SDT_CENTER

The desktop background bit map is, or is to be, centered on the screen. If this option is specified, then the values of the x the y parameters are inapplicable.
SDT_DESTROY
Any existing desktop background bit map is to be destroyed. The setting of this option is not returned on the WinQueryDesktopBkgnd function.
SDT_LOADFILE
For the WinSetDesktopBkgnd function the bit map is to be loaded from the filename specified. If the SDT_NOBKGND flag is also set then the bit map is loaded but the background is not set. Tiling and scaling may be performed at load time or later when setting the bit map.
SDT_NOBKGND
There is no desktop background bit map, that is the desktop background i a solid color. For the WinQueryDesktopBkgnd function the existing background is to be left unmodified unless SDT_DESTROY is also specified.
SDT_PATTERN
The bit map represents a fill pattern.
SDT_RETAIN
The szFile is, or is to be, remembered for use when the system is started.
SDT_SCALE
The bit map is, or is to be, scaled to fill the desktop. If this option is specified, then the values of the x and y parameters are inapplicable.
SDT_TILE
The bit map is, or is to be, tiled to fill the desktop.

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