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This article is from the Mac Programming FAQ, by Jon Watte h+@austin.metrowerks.com with numerous contributions by others.

2.1) What is a handle? (Memory - Mac Programming)

A handle is a pointer to a pointer to something. However, it is more
than that; creating a handle by taking the address of one of your own
pointers does NOT create a Handle; the Memory Manager will only deal
properly with Handles that are created using NewHandle or something that
calls it (such as NewRgn or GetResource).

 

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