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ABAP Keyword Documentation → ABAP Glossary →screen sequence
The sequence in which screens are processed, whose flow is determined by the next screen for each screen in the sequence. The first screen in a screen sequence is the initial screen. Screen sequences are called with transaction codes or CALL SCREEN. A screen sequence always belongs to a single popup level and is executed in a single window. A screen sequence is ended when the next screen with the screen number 0 is called.