RESIZE allows you to change the size of a viewport.

Because overlapping viewports are not allowed, you may 
need to delete a viewport that would get in the way of the
viewport you want to expand.

To resize a viewport, indicate a corner of the viewport 
you want to change. Increase or decrease the viewport size 
by moving the cursor in a horizontal or vertical 
direction.

When the size of the viewport is adjusted, press the 
cursor button. If a resized viewport overlaps an existing 
one, the function is disabled.
