With the SDK, developers can start building Native Client applications ahead of the official launch. Plans call for putting Native Client technology inside the Google Chrome browser; until then, users cannot access the applications. Google did not have an estimate on when exactly Native Client would be supported in Chrome.
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Also featured in the SDK is support for a set of interfaces dubbed "Pepper," providing compute, audio, and 2D Native Client modules. Pepper allows better access to browser systems for plug-ins.
The issue with native applications, including plug-ins, has been their access to the full machine -- even files. As a result, users are forced to make decisions about which applications to trust. Google with Native Client comes with rules that define valid code modules and limit access to a user's computer. It offers capabilities such as validation, which can prevent an invalid module from running.
Google had released a "sneak peek" of the SDK last year. In coming months, Google plans to add APIs for 3D graphics, local file storage and peer-to-peer networking. An ABI (application binary interface) is planned as well.