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I've been reading what I can on them when they pop up from time to time. The latest is a rugged set of modules attached to combat gear including a flip out screen on the chest which collapses closed should the user need to be promptly prone. Ultimately, these handtop devices could simply be the processing module; touchy tablet when alone or wearable computer core when assembled. Technically with smartphones, earbuds and such attached by wireless PAN; we're already using the early consumer wearable systems.