You can grant an access permission to a group or to a user. When you grant permissions to a group, the users belonging to this group inherit the group permissions.
In a property sheet, the list of permissions displays two columns:
By default, group members do not appear in the list of permissions, this is called the non-inherited display mode. However, you can display these users by clicking the Show All Authorized Users tool, this is called the inherited mode.
The behavior of the Permissions lists changes according to the display mode.
This is the default display mode, it displays the permissions actually granted to users or groups.
Members of selected groups are displayed
The Granted Permission column displays <none> for these users until you define a permission using the list
The Effective Permission column displays the actual permission of the groups and users; in this column the most extensive permission selected among the group or the user granted permissions appear, as shown in the following example:
When you delete a group and before you select the Apply button, the group remains visible in the list together with its users, the Granted Permission column displays <none>. When you apply the changes, the group and its members disappear from the list of permissions.