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Message: [QUOTE="Dave Thompson, post: 2385135"] In C89 they weren't required to be; it allowed "external" symbols -- as they are usually called in crosslanguage object/linker/etc., in C formally identifiers with external linkage -- to be implemented as case insensitive and/or insignificant beyond 6 characters, but categorized this as 'obsolescent', and C99 did indeed change it to case sensitive and at least 32 characters. (Unlike K&R1 syntax, also obsolescent in C89 but retained in C99, and implicit int and implicit functions, removed in C99 although not deprecated in C89.) The only case insensitive system I personally know of was RT-11, and you'll have a hard time finding one of those now. In fact, to be a bit crass about it, anyone who can keep one of those running today, or reconstruct it, isn't likely to need your "crutch" :-) :-) - David.Thompson1 at worldnet.att.net [/QUOTE]