IBM 3270 Hardware User's Manual page 15

The 3270 PC lets you see all three sessions at the
same time, like this:
I
VM
I
DD
Oil
@
I
J
In the illustration, you probably noticed that you
can't see all of the information in each window.
That's correct, but you can choose the window
you want to look into and enlarge it to fill the
entire screen. So it now looks like this:
PC
Oil @
I
I
Remember, the sessions in the other windows are
still running. When you are finished with one
session, you can shrink it back to its original
size and look into another window.
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3270 PC Work Station User's Guide