dOPC Client Toolkit Help file
Example
procedure TForm1.cShowValueClick(Sender: TObject);
begin
  if cShowValue.Checked then //show value
  begin
    Edit1.Color := clWindow;
    OPCGUI.AddItem('test',ShowOPCItem,Edit1,'text'); //show value in edit
  end
  else //don't show value
  begin
    Edit1.Color := clSilver;
    OPCGUI.DeleteItem(Edit1,'text'); //delete item
    Edit1.Text := ''; //show nothing
  end;
end;
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