Holger> I wasn't so concerned with the efficiency as with the availabilty on a Holger> large number of platforms. Do you want to port a "foreign" scheme Holger> system to a new machine type ? I certainly won't want to. I don't understand what you're saying. All implementations I mentioned are highly portable. Scheme 48 is currently restricted to 32-bit architectures, but Richard Kelsey is working on fixing that. -- Cheers =8-} Chipsy Friede, Völkerverständigung und überhaupt blabla