INSTANCE is CADKEY shorthand for drawing instance. You can
use options in the INSTANCE menu to add new instance views
to your layout, make various changes to instances, align
instances, and choose a new active instance. 

CREATE - lets you assign views to drawing instances that
         you want to place in your drawing layout.

MODIFY - lets you change a drawing instance's drawing 
         scale, rotation angle, location, view, lets you 
         blank and unblank entities, and change the levels 
         visible in an instance.

ALIGN  - lets you line up drawing instances by choosing
         the instance you want to align and entering 
         information about how you want to align it. 

ACTIVE - lets you change the active instance in a layout.
