Set screen and leave screen, Computer Engineering

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What happens if only one of the commands SET SCREEN and LEAVE SCREEN is used without using the other?

If we use SET SCREEN without LEAVE SCREEN, the program ends processing for the present screen before branching to . If we use LEAVE SCREEN without a SET SCREEN before it, the present screen process will be terminated and branch directly to the screen specified as the default next-screen in the screen attributes.

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