Buffering on the PI Server must deal with two situations. The node on which the PI Server runs may be rebooted, or the PI Server may be stopped while the API continues to buffer data. In the case in which the PI Server node must be rebooted, most points should receive a shutdown status. When the PI Server is stopped, only those points for which the PI Server generates data should receive shutdown. These two situations are handled differently on UNIX and Windows PI Server nodes.