A method, an apparatus and a program product may enable scalable bandwidth and memory for a system having processor with directly attached memory. The screw comprises at least one radial element adapted to abut against a stop surface within the first component, and a non-threaded end forming a guide which is adapted to slide in a bore in the second component. A source metallization is in ohmic contact with the source regions of the switchable cells. It uses the acknowledgements to traverse a binary tree, and thereby learn the device identification number of a new device. By restricting the minimum bend radius of the organiser to that of the fibre to be used bend control of installed fibre can be readily achieved. The handle and grip may be incorporated into the structure of the bow, or may exist as a separate, interchangeable part.