||The Palm Date Book that comes standard on Palm OS PDAs is a single calendar for your appointments and reminders only. Palm DualDate expands on those solo capabilities by letting you and other DualDate users send, receive, and synchronize your calendars--so, for instance, you and a friend can more easily locate a time when you both are free for lunch. The enhanced screen views include side-by-side calendars on the same page to complement the original single view. You also get some handy user options for maintaining privacy by limiting the data sent or received to your specifications. Though DualDate will work on both monochrome and color screens, color is better for easily differentiating between twin calendars, especially in monthly views. You can switch between solo and dual calendar views with a single icon tap.