Tha TaltOS project was started in the year of 2004 at the Budapest University of Technology and Economics at the Department of Measurement and Information Systems. The goal is to be able to install and to remove software components by radio connection on more (mitmót) sensor-boards simultaneously. The TaltOS will be component-based: easy to develop and modify the full system to be suitable for any kind of job. Hard real-time: fully deterministic and predictable to make it capable for using in critical situations too. Embedded operating system: just the most important hardware, task, and component handling, nothing more. (Every other features should be realized as components.) Run-time component change ability: it is the main Purpose.