Hierarchical computer systems for on-line applications.
D001695:Biology; D002140:California; D002641:Chicago; D003201:Computers / Q000295:instrumentation; D007196:Indiana; D007256:Information Systems; D007615:Kansas; D008328:Man-Machine Systems; D008511:Medicine; D003629:Modems; D009329:Nebraska; D009862:Online Systems; D012106:Research; D014481:United States; D014495:Universities