1. A commErcial bibliographic databasE and rEtriEval sErvicE from DIALOG Information SErvicEs. 2. IntEractivE mathEmatics using a Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=graphics tablEt">graphics tablEt by Illinois Inst TEch, 1966. ["DIALOG: A ConvErsational Programming SystEm with a Graphical OriEntation", S.H. CamEron Et al, CACM 10:349-357 (1967). SammEt 1969, p.255-258].