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This syntax places the content of the string parameter Froude_input$ in the input file: Froude.EPI. EPI stands for: External Process Input. It runs the process: Froude_calc.EXE which generates the output file Froude.EPO (External Process Output) and gets the output back in a TeLiTab named Fn#. When it is not TeLiTab you receive as output, you can make TeLiTab by adding the PARSE#() function around the GET$() function to process the results. You might want to check out the GET$() and PUT$() functions.

As mentioned earlier, we don't have to include the program in the relation. An external program should be placed in the application directory of Quaestor (My documents\My Knowledge\Applic by default) or the specific Knowledgebase application directory (_KBname\Applic). Otherwise, Quaestor will ask for the program location. 

To be able to select the Froude number as Top Goal for calculations, it has to be a parameter with a relation. The following relation retrieves the value for Fn from the TeLiTab Fn#.

  Add the following relation to the class Resistance:

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