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

Dim retvalue As Long
Dim ReturnString As String
Private Sub Command1_Click()
ReturnString = "0&"
retvalue = mciSendString("set CDAudio door open", ReturnString, 127, 0)
End Sub
Private Sub Command2_Click()
retvalue = mciSendString("set CDAudio door closed", ReturnString, 127, 0)
End Sub

regards