The Dutch VL-e project (Virtual Laboratory for e-Science) is a multi-disciplinary virtual laboratory environment for remote experiment control and Grid-based distributed analysis in experimental sciences. The aim of this project is to bridge the gap between the technology push of the high performance networking and the Grid and the application pull of a wide range of scientific experimental applications. It provides generic functionalities that support a wide class of specific e-Science application environments and sets up an experimental infrastructure for the evaluation of the scientific research. Hammer is part of these generic funtionalities.