The following example demonstrates trapping the WM_QUERYOPEN message to prevent the application from restoring from an iconized state. Note that the Window state of the form must be set to Minimized in the object inspector for this method to work. Example:

type
  TForm  = class(TForm)
  private
    { Private declarations }
    procedure WMQueryOpen(var Msg : TWMQueryOpen);
      message WM_QUERYOPEN;
  public
    { Public declarations }
  end;
var
  Form : TForm ;
implementation
{$R *.DFM}
procedure TForm .WMQueryOpen(var Msg : TWMQueryOpen);
begin
  Msg.Result := 0;
end;