I use "at one time" to show it for human. I know that really it makes a little of this, then a little of this then.... but it happens too fast (about 2 500 000 000 times/second) for human and he can say "at one time" Is everything clear?
Not sure if this is even remotely possible, but what if you run PT in a vmware virtual machine that can use the entire quad core, but trick every program in the virtual machine that there is only one core?