Google: Native Client

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Support the x86-32, x86-64 and ARM instruction sets.

NaCl started as a downloadable NPAPI plugin for multiple browsers, including Firefox, Safari, Opera and Chrome and was designed to transparently load and run other NPAPI plugins compiled as nexes.

http://www.chromium.org/nativeclient/getting-started/getting-started-background-and-basics

Download sdk: https://developers.google.com/native-client/sdk/download

Native Client: A Sandbox for Portable, Untrusted x86 Native Code:
http://static.googleusercontent.com/external_content/untrusted_dlcp/research.google.com/zh-TW//pubs/archive/34913.pdf

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