Hello, I spent some time today thinking and experimenting with Chromium integration and I have a more detailed plan to propose now. There is an important premise to be made. In both Chromium and Firefox OS, application's installation is very much in the hands of the web browser. It happens as the result of a user clicking on a button, inside a web store. Chromium is a bit more flexible but the other possibilities are basically just developer tools. I think this limits our possibilities a lot. We need to use the browser applications management, rather then installing applications ourselves and then launching them with some command line option. Of course Chromium is open source and we could develop the stuff which is missing. But, in my opinion it's just too much work and it's going to be a pain to maintain in the future, core developers are not going to care about it, given it's not important for their products. That said, I think I mostly figured out a plan to integrate with Chromium web apps management, without having to write a lot of code. * Chromium is started up with the sugar session, using the --no-startup-window, to make it invisible. The sugar extension has a "background" permission, which will keep it running even with no windows. * The extension runs a python script, using chrome.runtime.connectNative. Communication uses json-rpc wrapped in the message protocol supported by the extension. The python script fetches the list of installed activities (as exposed by chrome.management.getAll) and listen to changes. * The python script exposes a dbus service, allowing the sugar shell to get the list of installed applications and to display icons for them in the home. We use GIOChannel to read stdin, so that we don't block and integrate with the glib mainloop. * When the user click on an icon, a LaunchApplication is called on the dbus service, which proxies it to the extension, which launches the application. We will probably need a trivial patch to chromium to start it without UI. There is already a define for chromeos, but it's a compile time thing (in extension_prefs.cc, GetLaunchContainer). * The shell notices that a new window has been opened and associates it with the application information. This allows to activate and close the activity as necessary. * Uninstalling an activity works in the same way as launching. Shell -> python script -> extension. * Implementation of collaboration and datastore libraries could also be based on the python script messaging. I implemented (badly) a good part of this and I didn't find fundamental problems with it. Except for one, which is not specific to this plan. Sugar supports multiple instances of the same activity, web application frameworks doesn't. How are we going to deal with that? I haven't thought much about it yet, but it seems something we want to be very clear about.