The invention provides a centralized VPN management of a plurality of VPN sites by means of a VPN Information Provider. The heat exchanging structure has one or more heat transfer walls, each of the heat transfer walls having a first surface in contact with the liquid water stored in the shell, and a second surface in contact with the substance to cool down. Also, the method includes sending a remote assistance request to remote assistance personnel at a remote site in response to the determination that the installation process requires remote assistance in order to continue. The three-dimensional symbol is further displayed to rotate in a manner that corresponds with the view direction. The first locking member also defines a second opening having an inner periphery that is inset with respect to the outer periphery of the first component body such that a portion of the first locking member overlies a first portion of the first component body.