I'm looking to use Chromium OS for a specific business application, but I need access to local serial and USB ports. My reading of the Chromium docs says NPAPI plugins are not supported in Chrome OS, only PPAPI (Pepper). I'm a bit confused about PPAPI, as all docs talk about this in the context of Native Client, which as it's a sandboxed environment, cannot access local resources.
So my basic question is: Is it possible to write a PPAPI browser plugin that will work like a regular NPAPI browser plugin to access local resources?