Answer / anu

With SET SCREEN the current screen simply specifies the
next screen in the chain , control branches to this next
screen as sonn as th e 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 (screen chain) is called .The
called can then return to the suspended chain with the
statement LEAVE SCREEN TO SCREEN 0 .Sometime we might want
to let an user call a pop up screen from the main
application screen to let him enter secondary
information.After they have completed their enteries, 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.

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