hwndDesktop (HWND) - input

      Desktop-window handle or HWND_DESKTOP.

    fLock (BOOL) - input

      Indicates whether the visible regions are being locked or unlocked.

      TRUE

        Lock the visible regions
      FALSE
        Unlock the visible regions.

      rc (BOOL) - returns

        Success indicator.

        TRUE

          Successful.
        FALSE
          An error occurred.

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