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...ocation, and whose set of commands is bigger then Fortran-77) Question-2: Shall I generate executable code (compile the Fortran subroutines) through a Fortran compiler (which one ?) outside R environment ? Question-3: Shall I create a library ("so") object for each one of the 4 Fortran routiines or just the for the "main" one ? Question-4: What is the whole interfacing procedure on a Windows/XP system (steps sequence) ? Question-5: What is the whole interfacing procedure on a Mac/OS system (steps sequence) ? Thank you in advance for clarifying my confusion. Maura tutti...