AT&T 6300 Programmer's Manual page 494

VIEW
Statement
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A number of VIEW statements may be
executed. If the newly described viewport is not
wholly within the previous viewport, the screen
can be re-initialized with the VIEW statement
with n arguments. Then the new viewport may
be stated. If the new viewport is entirely within
the previous one, as the first of the following
examples, the intermediate VIEW statement is
not necessary.
RUN and SCREEN will disable the viewports.
VIEW and WINDOW statements allow you to
do scaling by changing the size of your view-
port. A large viewport will make your objects
large and a small viewport will make your
objects small. (Refer to "WINDOW Statement"
in this chapter.)