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Netflix offers Internet video streaming (" Watch Instantly ") of selected titles to computers running Windows or Mac OS X and to compatible devices.

Internet video streaming once came at no additional charge with Netflix's regular subscription service ; however, only a portion of Netflix's content is available via the " Watch Instantly " option.

In its simplest form, video is streamed to the user using standard PC hardware, and requires Microsoft's Silverlight software to be installed.

Viewing is initiated by pressing a " Play Instantly " button, and played back on the PC monitor.

Films can be paused or restarted at will.

According to a 2011 report by Sandvine, Netflix is the biggest source of North American web traffic, accounting for 24. 71 % of aggregated traffic.