Hi TedJP,
I guess this article by William Lam could be of general interest to you:
And with respect to:
Is there any possibility that the ID might get changed ?
Check the docs of UnregisterVM there it reads:
... However, the VirtualMachine managed object that results typically has different objects ID ...
I would interpret this as unregistering and newly registering a VM will give you different MoRef ID
Hope this helps :-)
--
Thomas G.