Overview of Calendar Calendar serves as a desktop calendar and appointment book. Calendar can help you schedule your appointments and remind you of them. You can use several calendars for different purposes. For example, a group can share a calendar for making conference room reservations. For more information about using Calendar, double click on an item from the list of additional topics below. For information about using Help, choose Using Help from the Help menu. Additional topics: * DECwindows Basics * Using Calendar * File Menu * Edit Menu * View Menu * Entry Menu * Options Menu * Help Menu * Calendar Views * Entry Editor or Day Note Editor * Brief History of the Gregorian Calendar * Julian Period * History and DECwindows Calendar