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Borderless Windowed Mode configuration

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I'm trying to mod a rather old game to enable it to run in windowed mode, specifically borderless window mode. Can you guys help me with the step of configuring direct x and the windows api window settings? I would be truly grateful. 


Regard Letters.

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I can only speak for d3d9 (for now);


- make sure you set the windowed flag in the d3d parameters to true

- after creating the window, use ShowWindow and UpdateWindow (to present the window)

- in the windowclass make sure the used style (for creating the window, i.e. CreateWindowEx) has the flag "WS_POP"			= CS_HREDRAW | CS_VREDRAW;
	mWc.lpfnWndProc		= (WNDPROC)pWindowProc;
	mWc.cbClsExtra		= 0;
	mWc.cbWndExtra		= 0;
	mWc.hInstance		= pHinstance;
	mWc.hIcon			= LoadIcon(0, IDI_APPLICATION);
	mWc.hCursor			= LoadCursor(0, IDC_ARROW);
	mWc.lpszMenuName	= 0;
	mWc.lpszClassName	= L"WindowClass";
	mWc.cbSize			= sizeof(WNDCLASSEX);
	style = WS_POPUP;									// borderless window (no difference fullscreen/windowed, no borders / rect issues

	if(0 == (RegisterClassEx(&mWc))) return false;

	if(NULL == (mHwnd = CreateWindowEx(NULL,L"WindowClass", L"Crealysm", style,
							 		 0, 0, mSettings.GetScreenWidth(), mSettings.GetScreenHeight(),
									 NULL, NULL, pHinstance, NULL))) return false;
		ShowWindow(mHwnd, pNcmdShow);

// another snippet

		mD3dpp.BackBufferFormat = mAdapterFormat;
		mD3dpp.Windowed = false;
		mD3dpp.BackBufferWidth = mSettings.GetScreenWidth();
		mD3dpp.BackBufferHeight = mSettings.GetScreenHeight();
		mD3dpp.FullScreen_RefreshRateInHz = D3DPRESENT_RATE_DEFAULT;
	else mD3dpp.Windowed = true;

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