Disclosed is a computer and method in a computer that detects attachment of an external device. A determination may be made whether the external device is trusted or untrusted. When the external device is deemed to be trusted, a first device stack may be instantiated in a first OS executing on the computer to conduct interactions with the external device. When the external device is deemed to be untrusted, a second device stack may be instantiated in a second OS executing on the computer to conduct interactions with the external device.