An application working with real-time data that needs to send the immediately will set PSH flag to accomplish this.
The push (PSH) flag is a transmission control protol (TCP) flag that instructs to send and receive the data immediately primarily for the applications dealing with real-time data. The real-time applications require that data be transferred as quickly as possible via TCP. The PSH flag becomes exteremly useful to facilitate the data transmission in real-time applications.
The PSH flag is responsible for delivering the data from the sender side to up the stack at the receiver side. When there is no more data to be sent, the PSH flag informs the receiver about this.
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