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With SET SCREEN, the current screen simply specifies the next screen in the chain. control branches to this next screen as soon as the current screen has been processed. Return from next screen to current screen is not automatic. It does not interrupt processing of the current screen. If we want to branch to the next screen without finishing the current one, use LEAVE SCREEN. With CALL SCREEN, the current (calling) chain is suspended, and a next screen (or screen chain) is called in. The called screen can then return to the suspended chain with the statement LEAVE SCREEN TO SCREEN 0. Sometimes we might want to let an user call a popup screen from the main application screen to let them enter secondary information. After they have completed their entries, the users should be able to close the popup and return directly to the place where they left off in the main screen. Here comes CALL SCREEN into picture. This statement lets us insert such a sequence into the current one. Can we specify the next-screen number with a variable. ( Yes / No ). Yes. The field SY-DYNNR refers to ________________. Number of the current screen. What is a dialog module ? A dialog module is a callable sequence of screens that does not belong to a particular transaction. Dialog modules have their own module pools, and can be called by any transaction. The syntax used to call a screen as a dialog box ( popup ) is _________________. CALL SCREEN <screen number> STARTING AT <start column> <start line> ENDING AT <end column> <end line> . What is a "call mode" ? In the ABAP/4 world, each stackable sequence of screens is a "call mode". This is important because of the way you return from a given current sequence. To terminate a call mode and return to a suspended chain, set the "next screen" to 0 and leave to it: LEAVE TO SCREEN 0 or ( SET SCREEN 0 and LEAVE SCREEN ). When you return to the suspended chain, execution resumes with the statement directly following the original CALL SCREEN statement. The original sequence of screens in a transaction is itself is a calling mode. If you LEAVE TO SCREEN 0 in this sequence ( that is, without having stacked any additional call modes ), you return from the transaction altogether. The maximum number of calling modes stacked at one time is ______. Nine.