A virtual recovery server is described herein. The display device includes a LED light source, a light diffuser positioned over the light source, and a lighted display screen mounted over the light diffuser. The driving circuit uses an amendment value corresponding to a difference between a given characteristic value set in accordance with the electro-optical element being driven and a center value of a range that can be taken by the electronic volume value to amend the electronic volume absolute value, thereby generating the electronic volume value. For example, the dispenser can include an additional button for manual operation of the pump. The dummy undersea hydraulic coupling member has a water displacement expansion chamber with a piston therein that allows trapped water andor air to move from the receiving chamber to the water displacement expansion chamber during connection of the dummy coupling member to the opposing coupling member. If they can, the update module calls an update function in all registered modules which then change their parameters to those set by the new configuration file.