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K>Как узнать заголовок активного окна Windows?
может так: GetWindowText (далее кусок из MSDN'а)

The GetWindowText function copies the text of the specified window's title bar (if it has one) into a buffer. If the specified window is a control, the text of the control is copied. However, GetWindowText cannot retrieve the text of a control in another application.

int GetWindowText(
HWND hWnd, // handle to window or control
LPTSTR lpString, // text buffer
int nMaxCount // maximum number of characters to copy
);
Parameters
hWnd
[in] Handle to the window or control containing the text.
lpString
[out] Pointer to the buffer that will receive the text.
nMaxCount
[in] Specifies the maximum number of characters to copy to the buffer, including the NULL character. If the text exceeds this limit, it is truncated.
Return Values
If the function succeeds, the return value is the length, in characters, of the copied string, not including the terminating null character. If the window has no title bar or text, if the title bar is empty, or if the window or control handle is invalid, the return value is zero. To get extended error information, call GetLastError.

This function cannot retrieve the text of an edit control in another application.

Remarks
If the target window is owned by the current process, GetWindowText causes a WM_GETTEXT message to be sent to the specified window or control. If the target window is owned by another process and has a caption, GetWindowText retrieves the window caption text. If the window does not have a caption, the return value is a null string. This behavior is by design. It allows applications to call GetWindowText without hanging if the process that owns the target window is hung. However, if the target window is hung and it belongs to the calling application, GetWindowText will hang the calling application.

To retrieve the text of a control in another process, send a WM_GETTEXT message directly instead of calling GetWindowText.