LPCTSTR lpClassName | pointer to registered class name.
LPCTSTR lpWindowName | pointer to window name.
DWORD dwStyle | window style.
int x | horizontal position of window
int y | vertical position of window
int nWidth | window width
int nHeight | window height
HWND hWndParent | handle to parent or owner window
HMENU hMenu | handle to menu or child-window identifier
HANDLE hInstance | handle to application instance
LPVOID lpParam | pointer to window-creation data

    HWND CreateWindow
    ( LPCTSTR lpClassName,
      LPCTSTR lpWindowName,
      DWORD dwStyle,
      int x,
      int y,
      int nWidth,
      int nHeight,
      HWND hWndParent,
      HMENU hMenu,
      HANDLE hInstance,
      LPVOID lpParam
    );

You should read the CreateWindow entry in - Microsoft® Win32® Programmer's Reference - for more detail.