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Re:Emscripten gains experimental pthreads support by bobajeff on Thursday August 13, 2015 @10:36AM (#10054506)
>And any computer can run just about any kind of code now.

Not if it's compiled (C, C++ etc.), uses compiled libraries (many Lua, Java and .Net apps) or any system calls/libraries (.Net)

Re:Emscripten gains experimental pthreads support by ergothus on Thursday August 13, 2015 @11:35AM (#10054974)
...Did you miss that this article is about Emscriptem, which allows you to run C on JS? (this resolving your first issue)