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Someone watching a cable series at a friend's house can finish the program at home or on their mobile device, schedule their DVR to record an episode, even record the full season, just by sampling the screen for a second or two.
ENGADGET: TVSync API unveiled, helps devs build second-screen and smart TV apps
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While being able to schedule DVR recordings from your mobile device is nice, an update currently being pushed to some Comcast DVRs is adding the ability for users to check exactly what shows are stored there from an app or web browser.
ENGADGET: Comcast quietly updates DVRs with ability to list stored programs from the web, mobile apps
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All three perform the same basic function -- they let you stream TV from your cable box (digital or analog), satellite receiver, or DVR to a computer or mobile device -- it's just that each is aimed at different segments of the market.
ENGADGET: Slingbox PRO, Slingbox AV, and Slingbox Tuner get official
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Previous Dish DVRs supported an optional Sling adapter that allows you to stream live or recorded programming from the DVR to Internet connected PCs, Macs and mobile device anywhere in the world, but as with all streaming services, you needed a live and relatively fast Internet connection to watch the programs.
FORBES: Hopping Across the Country With My TV Shows and Movies