[Q] Note 2 Multi-window help!!

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http://forum.xda-developers.com – Hi, okay so i have a non-rooted Note 2, and i've seen videos in which people has some apps (such as twitter, kakao talk, facebook, gmail.. etc) in their multi-window tab but i don't have them in my multi-window tab. and also i want to know something about rooting: Risks: Why would i want to do it: Do i lose my warranty doing it? Thank you. (HowTos)