allows users to hard reset their Palm—thus clearing all of the data—with few noticeable consequences. This also allows users to migrate to new Palm devices of the same Palm OS version, a feature that is helpful to those who lose or damage their device. Some models of Palm keep their data storage in volatile memory and require constant power to maintain their memory. Although these handhelds attempt to save the contents of memory in low battery situations by not "turning on," leaving a "dead" handheld for an extended period of time can cause this reserve power to be used up and the contents of storage memory to be lost. Some later Palms use NVRAM or microdrive for storage. Memo Pad can hold notes of up to 4,000 characters each; the newer Memos app increases field size from 3 to 30 kB. Memos are ordered in two ways: alphabetically, and manually (which allows the user to choose the order of the memos), and memos can be grouped in user-configurable categories. Memo Pad is for text only, not for drawings, and text can be entered using the Graffiti alphabet, using hardware or software keyboards, or using the 'paste' function. When Palm devices first became available, some Palm users started to create and exchange Memo Pad documents containing generally useful information, which came to be known as Memoware. To do list creates personal reminders and prioritizes the things the user has to do. Each To Do List item may also have: a priority, categories (to organize and view items in logical groups), attached Note (to add more description and clarification of the task). To Do List item can be sorted by: due date, priority or category The newer Tasks app features the following improvements: new interface, repeating tasks, alarms, etc. Preferences (also referred to as Prefs) shows program files with a special preference panel type which are not shown by the normal launcher. Programs can be changed by switching the type to and vice versa. Palm OS contains approximately 15 preference panels by default and new preference panels can be added just like any other application. Preference panels allow users to manage a number of settings, including Graffiti settings, sound settings, text shortcuts, network settings and the system time. Security (which is a panel on newer Palm OS devices) is used to configure Palm OS's security settings. These include the password needed to