Dev: Yes, WCF (System.ServiceModel) is part of the Universal Platform.
pl junkies: Thanks for noticing ;)
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Hi Hidekazu. the 320px / 20px gap mentioned in the Windows Design docs is "effective resolution" (aka "view resolution"). All the pixel values in XAML and HTML are in effective resolution :). Sorry, I don't have any expertise on desktop apps; Steve Wright had a talk on desktop apps and high-DPI support (http://channel9.msdn.com/Events/Build/2014/2-535)
Sorry for the demo fails in this talk - please check out the previous recording for a better set of demos (but if you want to download the slides, you should use the ones from this page)
Please note that the slides available on this page are NOT the ones I presented; please see the slides from the repeat talk to get the actual slides (but sadly several of my demos failed during that talk, so you should watch the video on this page!)
Thanks for doing the summary George! A couple of clarifications; sorry if it wasn't clear:
1) Agents are limited to 25s, but they won't be getting 100% CPU (unless the phone is otherwise idle). We do ensure they don't starve, but it is a low amount of CPU
2) XNA applications can have agents, but those agents can't use XNA libraries. So, for example, an XNA game can use an agent to update its tile... it just can't use 3D, SoundEffects, etc.
3) Audio agents run all the time while they are playing audio; if you pause the audio, they are terminated after ~10 mins.