Google Mail and Calendar allow you to assign a delegate who can access your Google Mail inbox, send and respond to email messages, and manage and share meetings on your Google Calendar. These permissions need to be given by the manager to the delegate. The delegate can create, edit, accept or reject new events. He can not: change the manager's calendar account settings, access the manager's contacts, or use the manager's task list.
To learn more about delegates and permissions in Google Mail and Calendar, you can watch video tutorials that provide an introduction to the use of delegates and permissions. View the Delegates and Permissions in Google Apps video tutorial.
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Google Apps Delegate & Permissions