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==Danger==

Developed by Danger Incorporated. Danger OS was a Java-based OS used on phones that Danger designed themselves. These devices were sold under many names such as Hiptop, Mobiflip, Sharp Jump, and (most notably) T-Mobile Sidekick. While it could run some J2ME apps (from version 2.3 onward), it also used its own proprietary J2SE-based APIs and SDK; for this reason, anything built using these APIs won't run on a standard J2ME emulator. To aid third-party software design, Danger has released a comprehensive SDK that contains a Hiptop simulator, development installation utilities, and Danger API information.