unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ComCtrls, ShellApi, RichEdit, StdCtrls;

type
  TForm1 = class(TForm)
    RichEdit1: TRichEdit;
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  protected
     procedure WndProc(var Message: TMessage); override;
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}
procedure TForm1.WndProc(var Message: TMessage);
 var
   p: TENLink;
   strURL: string;
 begin
   if (Message.Msg = WM_NOTIFY) then
   begin
     if (PNMHDR(Message.lParam).code = EN_LINK) then
     begin
       p := TENLink(Pointer(TWMNotify(Message).NMHdr)^);
       if (p.Msg = WM_LBUTTONDOWN) then
       begin
         SendMessage(RichEdit1.Handle, EM_EXSETSEL, 0, Longint(@(p.chrg)));
         strURL := RichEdit1.SelText;
         ShellExecute(Handle, 'open', PChar(strURL), 0, 0, SW_SHOWNORMAL);
       end
     end
   end;

   inherited;
 end;
procedure TForm1.FormCreate(Sender: TObject);
var
   mask: Word;
 begin
   mask := SendMessage(Handle, EM_GETEVENTMASK, 0, 0);
   SendMessage(RichEdit1.Handle, EM_SETEVENTMASK, 0, mask or ENM_LINK);
   SendMessage(RichEdit1.Handle, EM_AUTOURLDETECT, Integer(True), 0);
   RichEdit1.Lines.Add('SwissDelphiCenter.com: '#13#10 +
     ' Site is located at www.SwissDelphiCenter.com');
end;

end.