Techniques are disclosed for using a WI-FI Direct Services Application Services Platform for Layer 2 services, by extending a definition of a session in WFDS to include non-IP sessions as well. The detected pressure waveform signals are processed and data related to these detected pressure waveform signals are displayed. The systems may include various shaped troughs and support surfaces and various methods of assembling the same. The operating unit is provided command values of a position and orientation of the slave manipulator as the position and orientation thereof change. Thus, blending in the combustion chamber of the exhaust gas from the first scavenging ports and the fuel-containing gas from the second scavenging ports is suppressed, and short-circuiting of the fuel component to the exhaust port is suppressed. The invention further relates to the replaceable cartridge containing the plurality of screws for use in a screw gun.