Answer Posted / joyal joy

when call-screen is given the control is transferred to the
screen number that has been specified along with call-
screen and once the execution of the called screen is
completed the control returns to the statement just below
the call-screen statement.

set-screen changes the current screen number to the number
with the screen number specified with set-screen but the
control is transferred only when the leave screen statement
is encountered here the it is different from call-screen as
the control doesnt get transferred back to the calling
screen.

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