William,
At the current time, there are three different vLabs available. They vary depending on which course you are in. Here are the configurations:
A+ and Net+
1 x Windows Server 2008 R2 Domain Controller
1 x Windows 7 Workstation
MCSA Windows 8 70-687 and 70-688
1 x Windows Server 2012 R2 Domain Controller
2 x Windows 8.1 Workstation
MCSA Windows Server 2012 70-410 and 70-411
1 x Windows Server 2012 R2 Datacenter Domain Controller
1 x Windows Server 2012 R2 Standard Member Server
2 x Windows 8.1 Workstation
The way the website is laid out right now, the appropriate lab is launched based on which course you are in. We plan on adding more soon, but for now those are the ones that are available. We will be adding a master vLab page soon so that you can directly select which one you want. That will be important as we add more labs going forward.
Don Pezet
Host, ITProTV