1) Create temporary in_addr type structure;
InAddr.s_addr = ulClientIp;
strcpy(ip, inet_ntoa(InAddr));
2) Yes, open the userfile (one should create local cache, so you don't have to open same userfile more than once [it's possible, but uses more resources])
3) dwSharedMemorySize contains amount of memory your shared memory chunk contains (you must fill it yourself). If you have too little memory & paths don't fit, dwReturn value will be equal to amount of memory required to complete action successfully.
4) WM_KILL message is executed instantly by message handler thread (it's not dispatched to worker threads like datacopy messages are) - it returns 0 if client was killed, 1 on error
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