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I declare a variable unsigned char bdata Kde in a.c.
[in file a.c] unsigned char bdata Kde;
[in file b.c] #include <stdio.h> ..... extern unsigned char bdata Kde; sbit testbit=Kde^1; void main(void) {......}
"This may also explain the penchant of C programmers to remove uppercase from everything else, including URLs: fear of the preprocessor!" Actually, it's more likely to be those with a UNIX background - but then 'C' and UNIX are very closely linked! However, some parts of the internet (including some webservers) are case-sensitive (probably mostly the UNIX bits!) - so it's not always safe to fiddle with the capitalisation of a URL, E-Mail address, etc "I suppose that this means to use uppercase for the #defines" Yes, that is the convention. Preprocessor definitions can behave quite differently to 'C' symbols - especially concerning side-effects etc - therefore it is particularly valuable to have your Preprocessor definitions instantly distinguishable, to help avoid the common pitfalls (see any good 'C' book)