>Is it possible that form use another INCLUDE file with same constants but other values after some action? That is because of variety messages in my classes I defined in include file. Application is mentioned to be a international application with user option to change language on the fly. Problem is solved with one include file and many definitions and DO CASE and IF loops in definitions of my classes but of course it isn't nice and I won't accept that solution.
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>Thanks in advance.

Do not do what you're suggesting. The include file definitions are resolved at compile time, not at runtime. You will not be a happy camper doing what you suggest.

You can change definitions and undefine things using #UNDEF, but again, this is all resolved at compile time, not at runtime.

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>P.S. I am not looking for a third party product, but free piece of code.

Good luck - I'd have suggested that Steve Black's INTL is right on the money for this, but you think your time isn't worth what he's already implemented, tested and is willing to say works. Good luck.