With this command, you can display multiple screens simultaneously.
%QS causes the next screen I/O not to be
executed. The corresponding output screen is kept internally until the
following I/O, when it is displayed together with the next screen. Therefore
%QS only makes sense if the second output screen is
a window, that is, if it does not entirely overlay the first screen that was
Example: You can suppress the output of a screen A with
%QS; the next screen B is a window which partially
overlays screen A (perhaps a help window for one of the fields on screen A);
with the next screen I/O, the window B and the "underlying" screen
A are displayed simultaneously.
%QS command only applies to the subsequent
%QS reduces the number of screen I/O operations,
it also improves performance.