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+Library applets are a kind of program that can run concurrently with the application, they are started via the APT service. There can only be one library applet running at any given time.
+
+Below is the startup and exit sequence of an LLE library applet.
+![](https://user-images.githubusercontent.com/357072/34065069-698d8a14-e1cc-11e7-8b78-8add4ff01564.png)
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