A plug-in connector for hollow sections of spacer frames for insulating glass panes with two connector parts which can be plugged together. The valve or gate prevents flow of blood through the branch when it is closed and permits the flow of blood when it is open. The packer structure is disposed between a pair of tool end pieces one of which provides a fluid inlet for injection of hydraulic fluid into one end of passage and the other of which closes the other end of passage against outflow of hydraulic fluid therefrom. The host system identifies the virtual volume as the logical device in the second storage controller and issues a control command to this logical device via the virtual volume. The method of identifying devices using an IPv6 address comprises identifying the devices using device ID information for identifying the types of devices recorded in an area, excluding a company ID area and a serial number area of an interface ID area, using an EUI-64 ID format.