MSDN has an interesting article about Venturcom's realtime extension for Windows XP. I still think that Dave Cutler's decision that Windows NT would not be realtime was a mistake that cost Microsoft an entire market ("large" embedded systems).
Perhaps the most interesting part of the article is a comparison of response times between Windows XP, Windows CE, and Windows XP with RTX. These numbers show why Windows CE is almost nowhere to be found in the non-device realtime market: it sucks. (So much so, that a combination of the huge Windows XP OS with the RTX realtime extensions runs rings around it!)
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