For an overlapped or pop-up window, the y parameter is the initial y-coordinate of the window's upper-left corner, in screen coordinates. / Specifies the initial vertical position of the window. CW_USEDEFAULT is valid only for overlapped windows if it is specified for a pop-up or child window, the x and y parameters are set to zero. If x is set to CW_USEDEFAULT, the system selects the default position for the window's upper-left corner and ignores the y parameter. For a child window, x is the x-coordinate of the upper-left corner of the window relative to the upper-left corner of the parent window's client area. For an overlapped or pop-up window, the x parameter is the initial x-coordinate of the window's upper-left corner, in screen coordinates. / Specifies the initial horizontal position of the window. This parameter can be a combination of window styles, plus the control styles indicated in the Remarks section. / Specifies the style of the window being created. To specify an identifier, use the syntax "#num". When creating a static control with the SS_ICON style, use lpWindowName to specify the icon name or identifier. When using CreateWindow to create controls, such as buttons, check boxes, and static controls, use lpWindowName to specify the text of the control. If the window style specifies a title bar, the window title pointed to by lpWindowName is displayed in the title bar.
/ Pointer to a null-terminated string that specifies the window name. The class name can also be any of the predefined system class names. The class name can be any name registered with RegisterClass or RegisterClassEx, provided that the module that registers the class is also the module that creates the window. If lpClassName is a string, it specifies the window class name. The atom must be in the low-order word of lpClassName the high-order word must be zero. / Pointer to a null-terminated string or a class atom created by a previous call to the RegisterClass or RegisterClassEx function. / Specifies the extended window style of the window being created. / The CreateWindowEx function creates an overlapped, pop-up, or child window with an extended window style otherwise, this function is identical to the CreateWindow function. Creates a window with an extended window style.
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