The task "Control of water level height" is traditional task about regulations of type ON/OFF in both local and on-line laboratories. It is not automated. You control water level interactively from WWW panel. Pumping device can be controlled by more user at one time, but then they have a bit "shared" control. This multiple connection to one task is very popular among students. The task has no special didactical output. It is only for presenting the idea that also some real experiments, real device can be controlled by internet, no only computer games, video and music.
This task is the oldest remote control task in our laboratory (start at 2.2.2002), and it has the most connections (about 6.500).