When using DPP++, the best way to start it is to create a shortcut for DPP++ and use this shortcut instead of DPP's shortcut because DPP++ will automatically launch DPP. So you don't need to launch DPP yourself.

To close DPP++, just close DPP and DPP++ will be closed automatically.

Clic on the program icon in the tray area to access the program menu.