An abstract command's priority is an indication of the importance of an abstract command compared to other abstract commands of the same type.
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One way to assign importance is to determine how often you expect a user to use the command. When assigning priorities, lower numbers indicate higher importance. For example, a command of priority 2 is more important than a command of priority 5. Priorities help MIDP implementations map commands to device capabilities, for example, making the higher-priority items easier to choose.