FF1, FF2, FF3 all running

Please, I want to ask some questions

What is the reason that you want to run FF1, FF2 and FF 3, all at the same time?

What do you want to do with all this FF active at the same time ?

I think that there could be a very well reason why is not possible to have more than one FF running

FF is very well programmed to take the most resources and get as much CPU power as it can get to work in the best possible way, and I know that it uses all the cores available, even intel HT cores, and I have seen that when running FF have a 98% CPU level, so if you had another FF toghether at the same time they should share the computer resources and so it would be slower and do not get optimal results in render speed or preview.

Yes I know you probably will NOT be running both version at the same time or would you ?