window handles

How do I find the handle of a window that is currently in use? Is there any way to do this?
What I want to do is something like the following:

Code:

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HWND hWnd;
hWnd = /* something*/;

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Thanks

Go to MSDN and look up FindWindow()

I'm trying to get the handle of a dialog box window. Would this function work for that? If so, could you give me a code example of how to use this function? (The stuff at MSDN was confusing). IF not, is there a way to return the handle of a dialog box ?

Thanks

Code:

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The FindWindow function retrieves the handle to the top-level
window whose class name and window name match the specified
strings. This function does not search child windows.

HWND FindWindow(

    LPCTSTR lpClassName,        // pointer to class name
    LPCTSTR lpWindowName        // pointer to window name
  );       
Parameters

lpClassName

Points to a null-terminated string that specifies the class name or
is an atom that identifies the class-name string. If this parameter
is an atom, it must be a global atom created by a previous call to
the GlobalAddAtom function. The atom, a 16-bit value, must be
placed in the low-order word of lpClassName; the high-order
word must be zero.

lpWindowName

Points to a null-terminated string that specifies the window name
(the window’s title). If this parameter is NULL, all window names
match.

Return Values

If the function succeeds, the return value is the handle to the
window that has the specified class name and window name.
If the function fails, the return value is NULL. To get extended
error information, call GetLastError.

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that is what my reference says

[EDIT]Made it readable by Lower-Resolution Computers[/EDIT]

I think you use GetDlgItem() for dialogs. But that might be control only.

hWnd=GetActiveWindow();

but only if the window was created by your app.
(I am assuming you don't use threads)