I ment . Net code. Not c++. Noga
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PIServer.DeletePIPoint method will delete a PIPoint from the PIServer.
CAUTION: When you delete a point, all history for the deleted point is irrecoverably lost in the current archive. Records in older archives that contain data for the deleted point will no longer be accessible.
Just for your information, other methods to delete a PI Point and a discussion on what happens on deletion are available in KB00080 - How to delete a PI Point or Tag