what is the significance of the screen number 0in, Computer Engineering

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what is the significance of the screen number 0in

What is the significance of the screen number '0'?

In "calling mode", the special screen number 0 (LEAVE TO SCREEN 0) causes the system to jump back to the last call level. That is, if you have called a screen sequence with CALL SCREEN leaving to screen 0 terminates the sequence and returns to the calling screen. If you have not known as a screen sequence, LEAVE TO SCREEN 0 terminates the transaction.

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