x11 apps talk to XWayland, which then talks to Sommelier (a Wayland forwarding agent), which then talks to the Wayland server running on Chrome OS. Other commun

x11 apps talk to XWayland, which then talks to Sommelier (a Wayland forwarding agent), which then talks to the Wayland server running on Chrome OS. Other communications between Chrome OS and the Crostini system happens using the gRPC protocol. There is a program called Concierge on the Chrome OS side, that talks to Maitred inside the VM, to get it to do things. And apps inside the container use Garcon to talk to a service called Cicerone on the Chrome OS side (again, both these are over the gRPC protocol). All this is layed out here: https://chromium.googlesource.com/chromiumos/docs/+/master/containers_and_vms.md https://chromium.googlesource.com/chromiumos/docs/+/master/c...