Private Declare Function mciSendString Lib "winmm.dll" Alias "mciSendStringA" (ByVal lpstrCommand As String, ByVal lpstrReturnString As String, ByVal uReturnLength As Long, ByVal hwndCallback As Long) As Long

Private Sub cmdOpenCD_Click()
Dim lRet As Long
    lRet = mciSendString("set CDAudio door open", returnstring, 127, 0)
End Sub
Private Sub cmdCloseCD_Click()
Dim lRet As Long
    lRet = mciSendString("set CDAudio door closed", returnstring, 127, 0)
End Sub