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. did not have an estimate on when exactly Native Client would be supported in Chrome.

"Today, we've reached an important milestone in our efforts to make Native Client modules as portable and secure as JavaScript, by making available a first release of the revamped ," said Christian Stefansen, of the Google Native Client team, in a blog post.

Developers can view APIs, documentation, and examples to show how to write a module in C or C++ and communicate with JavaScript code executing in a browser. The SDK improves security, removing localhost restrictions in previous releases. "Beyond security, we've also improved the mechanism for fetching Native Client modules based on the instruction set architecture of the target machine, so developers don't need to worry about this anymore," said Stefansen.

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.