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This memo describes the version of DDT used as the command level of the A.I. Laboratory Time Sharing System (ITS). Besides the usual program control, examination, and modification features, this DDT provides many special utility commands. It also has the capability to control several programs for a user and to a single instruction continue mode and interrupt on read or write reference to a given memory location. This memo was prepared with the assistance of Donald E. Eastlake and many others.
