"Data stream push: Ordinarily, TCP decides when sufficient data have accumulated to form a segment for transmission. The TCP user can require TCP to transmit all outstanding data up to and including that labeled with a push flag. On the receiving end, TCP will deliver these data to the user in the same manner. A user might request this if it has come to a logical break in the data. Urgent data signaling: This provides a means of informing the destination TCP user that significant or ""urgent"" data is in the upcoming data stream. It is up to the destination user to determine appropriate action."
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