Feature request to make fixed base adress usable. Generally it is impossible to ensure newly created shared memory will be mapped into the same address, because the address space gets get fragmented almost instantly. I have used one workaround: * create dummy main executbale that does nothing but creates/opens shared memory at given address. * Since the process does nothing else (no other DLLs loaded, no dynamic allocations, no statics initialisation, nothing) it is ensured this request will succeed. * then a DLL with the main application code is called and passed the shared memory. This DLL does all the work, loads all other DLLs etc. Shmem may provide function open() which takes ownership of existing shared memory, as if it was created there. The difference from use supplied buffer is that lifetime management of shared memory block is kept inside the library. The trick could be nice item in "How do I..." hints page. /Pavel