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    <p>There are no nice ways to do this, but one approach that may work for you is to hook the application in question using SetWindowsHookEx(...) to add a GetMsgProc, which draws your overlay in response to WM_PAINT messages. The basic idea is that you're drawing YOUR graphics right after the application finishes its own drawing.</p> <p>In your main app: </p> <pre><code>.... HMODULE hDllInstance = LoadLibrary("myFavoriteDll"); HOOKPROC pOverlayHook = (HOOKPROC)GetProcAddress(hDllInstance, "OverlayHook"); SetWindowsHookEx(WH_GETMESSAGE, pOverlayHook, hDllInstance, threadId); </code></pre> <p>Off in a DLL somewhere:</p> <pre><code>LRESULT CALLBACK OverlayHook(int code, WPARAM wParam, LPARAM lParam) { //Try and be the LAST responder to WM_PAINT messages; //Of course, if some other application tries this all bets are off LRESULT retCode = CallNextHookEx(NULL, code, wParam, lParam); //Per GetMsgProc documentation, don't do anything fancy if(code &lt; 0) return retCode; //Assumes that target application only draws when WM_PAINT message is //removed from input queue. if(wParam == PM_NOREMOVE) return retCode; MSG* message = (MSG*)lParam; //Ignore everything that isn't a paint request if(message-&gt;message != WM_PAINT) return retCode; PAINTSTRUCT psPaint; BeginPaint(message-&gt;hwnd, &amp;psPaint); //Draw your overlay here ... EndPaint(message-&gt;hwnd, &amp;psPaint); return retCode; } </code></pre> <p>This is all win32 so your C# code will be p/invoke heavy and correspondingly quite ugly. Your DLL must be unmanaged as well (if you intend to inject into a process other than your own), making this an even nastier solution.</p> <p>This would solve your issue with z-order and clipping issues, as you're rendering into the window itself. However, if the application you're targeting does any drawing outside of the WinProc responding to WM_PAINT things fall apart; this is not an entirely uncommon occurence.</p>
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