A system and method is introduced for separating computing devices that work together. The computing devices appear to the user as a single device such as through using a single display and other I/O means. The output of computing devices such as the display output, may be monitored for unwanted display output to the user which may be filtered from the user. The device displaying unwanted content may then be reverted to a known state. Computing devices may communicate among themselves using display data while remaining separated. Secure services from the cloud to a user device may be offered through the separated computing devices that work together, services that utilizes separating and securing the user I/O from internet connected devices, while allowing to monitor and filter the internet connected devices. These services preferably use a key that is non-extractable for communicating with the secure cloud. Such services from the cloud server may include a secure remote desktop for VDI/DaaS and a secure web browser There is also provided implementation of the system on different architectures using SW only or using some HW additions. Usage examples for vehicles, enterprises and others are described.