Using the S3 as a bluetooth keyboard and touchpad for Nexus 7

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http://forum.xda-developers.com – I was doing some digging around and excuse me if this exists somewhere else but I have not run into anything relevant. I am looking for an app that will allow me to use my Galaxy SIII as a bluetooth keyboard and trackpad for my Nexus 7. This will eliminate the need to carry around a mobile keyboard as I already carry around both my phone and nexus. Hoping this exists.:rolleyes: (HowTos)