BlackBerry device user input and navigation
BlackBerry® devices include a keyboard, a trackwheel or trackball, and an Escape key, for input and navigation. The Escape key provides an easy way for BlackBerry device users to go back to the previous screen or remove a menu or dialog box from the screen.
A BlackBerry® Java Application for BlackBerry devices should use the following input and navigation model as closely as possible.
By default, the BlackBerry screen objects provide this functionality without customization; however, you must add menu items and additional UI and navigation logic.