Creates another enumerator that contains the same enumeration state as the
current one. Using this function, a client can record a particular point in the
enumeration sequence, and then return to that point at a later time. The new
enumerator has the same interface as the original one.
[out] On exit, contains the duplicate enumerator. If the function was
unsuccessful, this parameter's value is undefined.
Out of memory.
Value of ppenum
An unexpected error occurred.
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