The below code shows us how to call ENTER key  in delphi
1   
2   procedure TForm1.Edit1KeyDown(Sender: TObject; var Key: Word;
3     Shift: TShiftState);
4   begin
5   
6   if key = #13  then           //when user presses ENTER go to edit1 textbox
7   edit1.setfocus;
8   
9   end;