If you can think of a good test case for os.popen4(), I'd love to see it! I couldn't think of one earlier that even had a remote chance of being portable. If you can make one that passes on Windows, I'll either adapt it or create an alternate for Unix. ;)
Not tonight. I've never used popen4 in my life, and disapprove of almost all functions with trailing digits in their names. Also most movies, and especially after "The Hidden 2". How come nobody writes song sequels? "Stairway to Heaven 2", say, or "Beethoven's Fifth Symphony 3"? That's one for Barry to ponder ...
otoh-trailing-digits-are-a-sign-of-quality-in-an-os-name-ly y'rs - tim