Only a function call can return a value. See http://www.berezniker.com/content/pages/visual-foxpro/difference-between-function-and-procedure-statements

lnReturn = Blah('SomeString'  )

>I have a prg that receives parameters and returns a value. It does not have "Procedure" line at the top, it's just code in a prg.
>
>The last line of the file returns a value with RETURN lnReturn
>
>So, how do you call a PRG in a way that you can capture the return value?
>
>I've tried stuff like:
>

>Do Blah.prg with 'SomeString' to lnReturn
>

>
>and other goofy attempts, but none have worked.
>
>What to do?