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I'm sure you can do this from Excel. A google search for "excel call vba function" which takes me to a page from "Excel VBA Programming for Dummies" where it says the following:

Now it’s time to call this VBA Function procedure from a worksheet formula. Activate a worksheet in the same workbook ...

I have puzzled over this for many hours and I can't find a single example of how to do this.

I don't want to control PlanMaker from BasicMaker, just put the result of a BasicMaker function into a cell.

I have a file Jim.bas with the following:

function JimJam as integer
JimJam = 1000
end ...