A collection tank for use in a vacuum operated earth reduction system, the collection tank comprising a closed first end, an open second end defining a tank sealing flange and a body extending between the closed first end and the open second end. In one implementation, the eyepiece is for use with a display where both the eyepiece and display are head-mounted, with the eyepiece projecting an image from the display into the user’s eye. The server deploys administration agents on the computers in the network for performing various administrative tasks.