"The meaning of the tours is to try to show you some of the information I think you will find interesting and the incredible manifold of the information on this server."

"You will enjoy your tour best if you do not use your browser's forward- and back-button, but use our guide-links (located in the upper frame) instead."

"Important: If you get already visited tours even though you have chosen a new one, please empty your browser's disk cache."

"Please choose any tour you want."