The backend software can be parallel or sequential and simulation or information based
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It can be COBOL, Fortran, C++, Perl ...
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For purposes here, we need only to define its interface needed to
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run it
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set its parameters -- i.e. its input mechanisms
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get its output -- numbers or visualization
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This backend interface is defined as an XML file e.g. <program type="physics"> <run domain="npac" machine="maryland" type="pcnt" > c:\myprogs\a.out</run> <input type="htmlform" > <name>userinput</name> <field default="10" >iterations</field> .......... </input> <output> ...</output> </program>
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