How do I zoom on a windowed area?

Hi All, Google is failing me on this one too. I would like to make a rectangle (windows) around a particular spot on the drawing and zone to that rectangle (windows). Many thanks, -T

Found it:  View, Widowed Zoom

Right under my nose.  I must have looked in view three times before posting.

Or mouse wheel.
 The numbers in the right corner tell you the units between small dots and lines.

The mouse wheel is the same as <ctrl><+> and <cltr><->.  Sweet.