Previous research has shown the advantages of digital tabletop setups for human computer interacion when compared to a standard desktop computer. But projects in this area are still constrained by hardware limitations and complex software interface design challenges. The „Shared Design Space“ project was created in 2006 to demonstrate a novel tabletop tracking device and to support and observe group collaboration on a tabletop setup. „Pentable“ combines the same hardware setup with common interface devices like an lcd monitor, mouse and keyboard for a single user workplace. Instead of focusing on group interaction, the purpose of this project is to investigate working with legacy Windows applications in a tabletop environment and evaluate user performance and satisfacion compared to a standard desktop computer. This paper describes the functionality of the setup and the findings of an informal user study.