Creates an overlapped, pop-up, or child window
#include <WinAPISysWin.au3>
_WinAPI_CreateWindowEx ( $iExStyle, $sClass, $sName, $iStyle, $iX, $iY, $iWidth, $iHeight, $hParent [, $hMenu = 0 [, $hInstance = 0 [, $pParam = 0]]] )
| $iExStyle | Extended window style |
| $sClass | Registered class name |
| $sName | Window name |
| $iStyle | Window style |
| $iX | Horizontal position of window |
| $iY | Vertical position of window |
| $iWidth | Window width |
| $iHeight | Window height |
| $hParent | Handle to parent or owner window |
| $hMenu | [optional] Handle to menu or child-window identifier |
| $hInstance | [optional] Handle to application instance |
| $pParam | [optional] Pointer to window-creation data |
| Success: | The handle to the new window |
| Failure: | 0, call _WinAPI_GetLastError() to get extended error information |
Search CreateWindowEx in MSDN Library.