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dtSearch Text Retrieval Engine Programmer's Reference
IOptions::PrivateDir Property
__property BSTR PrivateDir;

A directory that the dtSearch Engine can use to store temporary files. Most applications should not set PrivateDir. 

PrivateDir, if non-blank, must be unique for each concurrent user of the dtSearch Engine. 

If the PrivateDir is blank, no directory will be reserved for temporary files, and dtSearch will use the Windows GetTempPath() call to get a directory for temporary files.

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