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If your using Windows, its the API call for a window.
It stands for (h) handle (Wnd) Window.
Its the standard call all other commands use to gain access to a window.
Microsoft likes to prefix their variables with the lowercase letter h to represent a 'handle' to that object.
For instance, an hDC is a handle to a device context.
If you've done any programming using the Windows API, you will encounter many such syntactical conventions.
You can reference any given window through its hWnd handle.
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