A ceiling system having panels suspended from a ceiling with a frame and suspension connections. The enhanced network driver and control interface being portable to multiple network hardware devices. The debug support unit has a data output circuit, which, in response to the status information signal, when the branch information contains a branch, outputs the converted instruction address serially to the tool bus, and when the branch information contains no branch, outputs a branchless signal to the tool bus. If superposition has not been preserved, the user can be confident that the database provider has cheated, and has tried to obtain information on the query. To enhance the reusability of the extracted PIM, a business level service model along with a service dependency model is generated rather than IT level classes. The specific operating conditions favoring the simultaneous nitrification and denitrification include the controlled injection of a slight quantity of air, adjustment of the level of nitrogen load and the level of carbon load thereby making possible elimination for the most part of the release of unwanted nitrogen in the form of NO3 or NO2.