The GetOverlay method retrieves the overlay
HRESULT GetOverlay(
    [in] LONG p_nIndex,
    [out, string] LPWSTR* p_pwsOverlayId
);
Parameters:
p_nIndex,
    [in] - overlay index
p_pwsOverlayId
    [out, string] - overlay id
Return values:
S_OK on success or COM error codeNV_NOT_INITIALIZED - Initialize was not calledNV_UNKNOWN_PROFILE - no profile loadedNV_PROFILE_ERROR - error reading profileRemarks:
There can be multiple overlays in a profile.
For layout options, see Working with Layout objects.
