The opening control mechanism includes a frame, a support shaft, a first pulley, a second pulley, a first elastic member and a second elastic member. An operation is performed for identifying misconfigurations to a DHCP option configuration of a DHCP agent between a DHCP server and a client of the DHCP server. Exhaust is recirculated from the selected group of cylinders to the engine intake wherefrom the EGR is ingested in the remaining engine cylinders and the selected group of cylinders. The model clause comprises a rule that has a left-side expression and a right-side expression. The valve is characterized in that the rotation of a second member in a given direction with respect to a first member moves the valve from a configuration in which a conduit communicates hydraulically with a sleeve, to a configuration in which the conduit communicates hydraulically with a flush conduit via a duct and a channel to flush an end portion of a catheter. Some user groups control devices according to which members of a group may have access to certain functions, information, etc.