'ZOOM (Z)
Increases or decreases the apparent size of objects in the current viewport.
Specify one of the following:
Center:
specify Center point and Magnification or Height (a smaller value for
the height increases the magnification)
Extents:
same as SolidWorks Zoom to Fit; fits all objects into the current view
Scale:
specify Scale Factor (2X doubles current image; 0.5X makes it smaller)
Window:
specify First Corner and Other Corner
Previous:
returns to the previous view
<Realtime>:
The pointer changes to 
. Hold the pointer down anywhere in
the window and move the pointer up to increase magnification, down to
decrease magnification. To exit from the command, press Enter
or Esc.
See also 'PAN,
Transparent
Commands.