The　Internet　is　a(66)network　of　networks　which　interconnects(67)ranging　from　the　simplest　personal　computers　to　the　most　sophisticated　mainframes　and　supercomputers.　This　network　of　networks　is　used　for　an　extraordinary　range　of　purposes　-　long　distance　collaborations,　retrieving　free　software　and　documents,(68)library　catalogs,(69)in　t6　supercomputers　-　the　list　of　current　Internet　activities　and(70)is　large　and　the　range　of　possible　future　applications　is　as　unlimited　as　our　imagination.