IP_hTASK historian, char* retbuf, int buflen, int bufferid
ST_OK on success. Otherwise ST_ERROR, and the retbuf will contain a NULL-terminated character string with an error message. If the return value is ST_OK, the retbuf may not contain useful information.
This function destroys the temporary internal buffer associated with an interpolation request. The memory allocated by an interpolation request can be very large, and will persist until it is explicitly destroyed.
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