Scenario: fairly grunty PC (Core i7 6 core) running specific mathematical and simulation software.
More than one user wants to access the PC to run their stuff since the CPU can cope with running different models at the same time.
I thought about two solutions.
Install Windows 2012 R2 on the PC and publish the apps. Then I guess each user needs a Windows Server CAL. Theoretically that would work but it's not clear if that apps they run would run under 2012 and they occasionally want to access the command prompt and do stuff.
Install a hypervisor such as VMWare and run a number of Windows 7 instances on it that each user could RDP to.
It's here I get stuck with licensing. One Microsoft document I found about licensing Windows 7 for use with VM's says if the Windows licence has SA (which it does) you can run up to four instances of Windows in a local virtual OSE. But then it says only one instance per virtual OSE. (Who writes this stuff?!). This is the table that I am looking at. I am looking a row 4.

I guess I want to know is if users have licensed (SA) copies of Windows 7 Pro on their desktops, can I put VMWare (say) on a box, and then install 4 copies of Windows 7 as VM's on that box and users then RDP to the box to run their work? If so do I need 4 copies of Windows for that box or is just one SA version enough?