Described is a technology by which a computer system operates in a mode that is different from a general purpose operating mode, upon detection of a special actuation mechanism coupled to the computing device. For example, actuation of a special hardware button may boot or resume a sleeping computer system into a direct experience upon actuation, including by launching a special program corresponding to that button. The computer system may thus enter a mode in which it mimics a special purpose device such as a consumer electronics device, e.g., a dedicated media player. When in a direct experience, the computer system may also operate in a constrained/sandboxed mode in which operating system limits available functionality to less than what is available when running as a general purpose computer system, e.g., keyboard operation and/or file access may be limited. Different actuation mechanisms may correspond to different modes.