A query about the above. I wish to use it to enable us to share memory amongst processes. Whilst it obviously should be possible to do this using CreateFileMapping on Windows and mmap on linux, which the class uses, the documentation is not clear as to whether it is designed be used in this way. Looking at the source code: (a) It does not provide a kernel name to the CreateFileMapping call on Windows. According to the MSDN docs this is the only way to share one mapping amongst multuiple processes, and therefore it is possible that a different mapping, albeit of the same file, is being created for each process. I don't want that as the point is to keep memory usage down. (b) On linux it only uses MEM_SHARED flag if the file is read only. If this flag isnt used, is there the possiblity that more than one copy of each page of the file will be loaded into physical memory too? Clarification on any of these points is most welcome Thanks Richard Morrey.