Cross-environment rendering and user interaction support provide a seamless computing experience in a multi-operating system computing environment. The multi-operating system computing environment may include a mobile operating system and a desktop operating system running concurrently and independently on a shared kernel of a mobile computing device. User interaction support includes handling input events initially received in the shared kernel by accepting the input events in the desktop operating system and translating, mapping, and/or passing the input events through a virtual input device to the mobile operating system such that applications of the mobile operating system receive the input events as if coming from a user interaction space of the mobile operating system. The mobile computing device may be a smartphone running the Android mobile operating system and a full desktop Linux distribution on a modified Android kernel.