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Computing Systems like NPAC's WebFlow control flow of information between linked objects. For example, in dataflow model, user must supply routines to process input of data that drives a given module and output of data for other modules
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| 2 |
TANGO supports shared objects and user supplies routines that read or write either
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Total state of application or
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Change in state of application
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| 3 |
In each case one needs an API to object which can either be proprietary (as in AUTOCAD or ArcoInfo GIS) or generic as in CORBA or Web Middle tier linkage
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