The most interesting upcoming Android feature that Google demoed at I/O is a “cloud-to-device” messaging API.

在Froyo众多的新功能中，最让人感到有趣的也许是Google在I/O主题演讲上所展示的“cloud-to-device” messaging API了。

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About cross-domain limitation, the cross Document Messaging API is interesting to allow cross-origin communication but the developer as to be very careful using it and ensure security at all time.

至于跨域的限制，跨文档进行消息传输的API非常有趣的允许跨源(cross - origin)通信，但是开发者需要非常小心的使用它，在任何时候确保安全性。

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There is no difference in the messaging client API between bindings mode and client mode.

绑定模式和客户机模式之间的消息客户机api中不存在任何差异。

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This pilot uses Cloud to Device Messaging (C2DM) which is part of the Android API to link the Google App Engine server and Android client.

FORBES: Connect

According to TechCrunch, buying TokBox added new services that Telefonica could offer developers through its BlueVia Application Programming Interface (API) platform: these already included voice, messaging and billing APIs when the TokBox deal closed.

FORBES: If You Can't IPO, Telefonica Might Help

Although NHN Japan's self-developed apps alone will be released at first, NHN Japan has made it clear that it plans to increase the availability of apps developed by external business partners by opening its API and offering developers access to LINE's functions including friends lists, messaging and payment.

ENGADGET: Line messaging and VoIP app adds 'timeline' and 'home' features, throws in new platform for app integration