This system provides for communications between several different types of wireless networks and a mobile node. More particularly, the present invention pertains to certain classes of chemical moieties which strongly quench ECL, and the use of these ECL quenchers in combination with ECL labels, for example, in ECL assay methods which employ an ECL quencher and an ECL label. The engine preferably is a stratified charge engine. A controller is provided for controlling the onoff of the switching member. The controller routine executes the coroutine the subsequent time on the subsequent thread.