Sub CloseAcadSessions()
Dim ACad As Object
SessionIsOpen = True
On Error Resume Next
Do While SessionIsOpen
Set ACad = GetObject(, "AutoCad.Application")
If Err.Number <> 0 Then
' AutoCad is not running
SessionIsOpen = False
Else
'AutoCad is running
ACad.Quit
End If
Loop
Err.Clear
On Error GoTo 0
End Sub