Use-cases for alternate entry point in BlackBerry

What is an alternate entry point in a BlackBerry application?

When should we use this?

Is it 开发者_开发知识库for doing background processing?

If the alternate entry point has an icon, then which icon is shown in the BlackBerry app folders -- the main application icon or the alternate app icon?

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It is indeed for launching apps that run in the background. See Running in the Background and Creating an Always-On Experience for more details.