HRESULT AboutDlg(HWND hWndParent, PTSTR pszTitle);
Displays an About dialog box that identifies the text-to-speech engine and contains the copyright notice.
· Returns NOERROR if successful, or one of these error values:
VTXTERR_INVALIDMODE
VTXTERR_INVALIDPARAM
VTXTERR_INVALIDWINDOW
VTXTERR_NOTSUPPORTED
VTXTERR_OUTOFMEM
hWndParent
[in] Handle of the parent window. If this parameter is NULL, the engine returns NOERROR if it supports the About dialog box or VTXTERR_NOTSUPPORTED if it does not.
pszTitle
[in] Address of the string to use as the title of the dialog box. This parameter can be NULL to direct the engine to provide a default title.