You might need to view different parts of an object at the same
time. For a permanent object, you can define windows that have non-overlapping
views as well as windows that have overlapping views. For a temporary
object, you can define windows that have only non-overlapping views.
- A non-overlapping view means that no two windows view the same
block of the object. For example, a view is non-overlapping when
one window views the first and second blocks of an object and another
window views the ninth and tenth blocks of the same object. Neither
window views a common block.
- An overlapping view means that two or more windows view the same
block of the object. For example, the view overlaps when the second
window in the previous example views the second and third blocks.
Both windows view a common block, the second block.