Abstract
Four simulations of online services have been produced by students of the Department of Information Studies, University of Sheffield; FOSSILS, a simulation of Lockheed Dialog; BLAISERS, a simulation of BLAISE MARC information retrieval, editing MUTE, a simulation of BLAISE MEDLINE, and SSDC, a simulation of SDC. These have proved valuable in teaching use of a keyboard, basic commands and more advanced techniques. Written in BASIC, the programs have been transferred successfully to a wide range of computers including microcomputers, in several countries.

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