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Message: [QUOTE="Malcolm, post: 2414678"] It very frequently happens that you only want to expose certian functions to the outside world. For instance one of my files does clustering. It uses the kmeans algorithm, so I want the caller to be able to call the function called kmeans(). Internally the algorithm needs a cluster structure that conints a list of members and centroids, which the caller doesn't need to know about. Also, it doesn't make sense for him to call any of the subroutines directly. By making the subroutines "static" I can use a simple name like "assign" without any danger of a name clash, and also I know that I can modify the functions to my heart's content, as long as I still provide a list of clusters for the call to kmeans(), without breaking anything else. [/QUOTE]