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unit Unit1;interfaceuses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls;type TForm1 = class(TForm) Button1: TButton; Label1: TLabel; procedure Button1Click(Sender: TObject); private { Private declarations } public { Public declarations } end;var Form1: TForm1;implementation{$R *.dfm}procedure TForm1.Button1Click(Sender: TObject);var s: string;begin s := 'c:\windows\Greenstone.bmp'; SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, PChar(s),0);end;end.