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Here, 'internal' refers to RSC loaded by the AES (case trindex set to NULL), and 'external' refer to RSC loaded by a function external to the AES (by RsrcXload for example, as it is the case for built-in RSC). Well, this is how i understand the doc.

BTW, you are right : the doc is not clear. It should be re-written. A simple replacement of 'internal->loaded' and 'external->builtin' is not enought... and moreover, it's not correct neither.