Why do I get ??? in some call stacks? (Error Detection)

Purify displays ??? in place of a function name when it cannot determine any symbols for the module. This often happens if Purify cannot locate debug data for the module.

Purify looks for debug data in the module itself and .pdb, .dbg, and .map files. For information on how Purify locates debug data, click images\shortcut.gif

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