This type is used to define a set of Users who have a rights to edit a set of pages.
A typical scenario is when more than one user is working in a page but they don't want to show to others the page until is finished (defining the View Status as Private) or they don't want others to edit it (Edit Status as Closed).
To define a new Group use the main menu 'Groups of Users' option.
To associate a page with a Group just type:
in any place of the page.