The invention relates to a microfluidic micromechanical system having integrated active elements and a method for microfluidic process control in a microfluidic micromechanical system. A set of markers attached or associated with the object is optically tracked and geometric translation is performed to use the coordinates of the set of markers to determine the location and orientation of their associated object. A conductive path may be present in the conductive interface, and the conductive path may be interrupted by one or more local electrical isolations. With this configuration, the wheel is already in the lock state by the parking brake if an ignition key is inserted or removed in or from the key cylinder in the LOCK position. The arms of the plunger extend through a guide member and resiliently releasable locking means are provided, whereby the plunger can be readily pushed forward to press against the tree trunk but is locked against outward movement unless and until the arms of the plunger are squeezed together to release the locking means.