We have one user start conversions and then another, on a later shift, who does post-conversion work. What we want to know is how can the second person be sure the conversion is complete if they don't use the same user ID?
If you are using virtual center ... there will be an activity in the bottom about "import machine" and when it hits 100% it's done. I think it's the same if using ESX as a destination.
So all you would have to do is check the activities when connected with the VIC.
Another customer of mine setup a neutral workstation to facilitate the conversions themselves and used remote desktop access to it.