Maybe because the VMS people made the assumption that any language can call any other, so no specific documentation is needed? That was one of the goals of VAX, and it should have carried to Alpha. So assuming that the data type mapping is clear, nothing else should need to be said. paul On Sep 12, 2012, at 3:22 PM, Sampsa Laine wrote: Well I always wanted to play with COBOL lol. It's just infuriating how there's no decent docs on how to call a damn C function anywhere. I mean there is for DEC UNIX COBOL, but not VMS. On 12 Sep 2012, at 22:00, Mark Wickens wrote: Sampsa, I've said it before, I'll say it again - your vintage forays sometimes make me look distinctly normal ;) Keep up the good work! Mark.