How does MO ID value get generated ?

Hi,

I'd like to know if MO ID value get never changed once assigned.

I think using the MO ID value like "vm-88" can help me to identify a certain virtual machine in the environment.

But of cource there would be vMotion, HA TKO or conversion of VM image, and I'm wondering if the MO ID of virtual machine could be changed in those cases.

Is there any possibility that the ID might get changed ?

Any help would be appreciated.