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I am novice with Win32 , and I have been pursuing a problem (if it can be called a problem at all) with Windows blocking your program's flow during the event when a user grabs the window title bar and moves it around the screen. I have no legitimate reason to solve this problem, except that it bothers me. A few possibilities include removing the frame altogether, but it seems an inconvenient hack. Some games (single player) do not find this a problem at all. I have read however, that multiplayer games might experience problems when the program freezes as it expects continuous flow of information and can be overwhelmed after such a delay. I have tried adding this to my WindowProc switch (uMsg) { case WM_SYSCOMMAND: if (wParam == SC_CLOSE) PostQuitMessage(0); return 0; ... ... default: return DefWindowProc(hwnd, uMsg, wParam, lParam); } return 0; And this seems a quick hack, except that when I mousedown over the close icon I can pull the mouse away and let go without closing the program, and during that time, when the close icon is held down, the program once again is blocked. Furthermore, I do not know how to manually include the code necessary to move the window when the user clicks the titlebar and drags the mouse. For starters I do not know which uMsg 's and wParam 's to handle. My question is then, how do I disallow blocking during the case when the user clicks down the exit button (or minimize/maximize buttons) while still handling the case when the mouse is clicked and released over the button, and how do I allow the user to move/drag the window without it blocking the program (or what message is sent when the title bar is clicked without it being a button or menu)? I am creating the window with WS_SYSMENU | WS_MINIMIZEBO

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