Shared Permissions
The Shared Permission pages allow you to automatically create a Share condition between User Groups whenever a specified object (an organization, people, opportunity, project, case, or task) is created. For example, if you have a Sales Manager group you might want to share all Opportunities newly created by users in the Sales Manager group with a Project Manager group. Project Managers might like to see what potential projects are in the sales pipeline. You wouldn't want Project Managers to be able to edit the Opportunities (i.e., give them Write access) but you would like them to have Read access to all newly created Opportunities automatically.