In addition to the above solution of use lib, make sure you limit who has write access to that file(s) to only those that should be allowed to make changes. If this is to be shared, it could happen that one person needs to make a small change to the way a given support functions works, but breaking everyone else's use of it. Such changes need to be discussed and fully documented by only a limited number of people working on the project.

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Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain