To me security is just one aspect of Embassies, whats more interesting is use native api as the web DPI, POSIX or DrawBridge, and deliver native app image through Missive. This aspect works more like NaCl, in fact Embassies is largely based on Xax, which is considered a NaCl-like project.

We have seen the theory in the NSDI presentation, but we haven't seen the demo, especially running Windows application through DrawBridge in Embassies browser. Smiley