Informs Excel that the specified topic has been updated, and that cells linked to it should be recalculated.
void UpdateTopic( LPCWSTR lpszTopic );
A pointer to a null-terminated unicode string containing the topic whose value has been updated.
This function informs the RTD server that the specified topic has been updated. Any cells depending on the topic will automatically be recalculated. This method may be called from any thread.