FORTRAN charcter strings

Hello,

I try to use a Windows DLL with FORTRAN routines in R. All routines work fine,
except those which exchange a character variable with R.

The documentation "Writing R Extensions" says it's compiler dependent whether
character string exchange works with FORTRAN routines or not.

Why doesn't it work with every compiler?
Does anyone know a FORTRAN90 compiler for windows that works?

Thank you,
Thomas Dick
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