title: Class Styles in WNDCLASS, what does it reference to ? Win32
body: <p>what does it class style means actually ? it confused me.  this is from MSDN: <strong>style 
  Specifies the class style(s). This member can be any combination of the class styles.</strong> </p>
  
  <pre><code>typedef struct _WNDCLASS { 
      UINT       style; 
      WNDPROC    lpfnWndProc; 
      int        cbClsExtra; 
      int        cbWndExtra; 
      HINSTANCE  hInstance; 
      HICON      hIcon; 
      HCURSOR    hCursor; 
      HBRUSH     hbrBackground; 
      LPCTSTR    lpszMenuName; 
      LPCTSTR    lpszClassName; 
  } WNDCLASS, *PWNDCLASS; 
  </code></pre>