Setup for RoboCAN

I'm using 3 SBL1360 motor-controllers to drive 3 BLDC motors. I'd like to communicate with all of them via CAN bus. I'd like to have a central computer (Intel NUC) with a CAN adapter control the entire network (is that even possible?). From my understanding I can use RoboCAN to accomplish this. Is this accurate? i.e. Can I use the Intel computer to send commands to the controllers on the node via CAN or do I have to connect to at least one of the controllers via USB?

Finally, do I have to configure all the 3 controllers on the network for RoboCAN?

I updated the initial question and added an image.
What are the roles/functions of the microcomputer and the laptop+CAN adapter?

Ok. So if i have a computer, adapter and motor controllers can I use RoboCAN? I'm still not clear why it's not possible

RoboCAN is proprietary protocol layer sitting on top of RawCAN (probably). If my guess is correct your computer with adapter will be able to sniff CAN frames going between the nodes but you won't be able to interpret them unless you reverse-engineer RoboCAN protocol. Furthermore, if you want to send commands to the controllers, I suspect you'd have to implement entire protocol on you PC so that it could pretend to be one of the nodes on the network. All this can be done but is ABSOLUTELY POINTLESS.

The "microcomputer" on the image is where you want your PC to be. Simply connect PC to serial port of one of the nodes and let it do all this work for you. You still have to implement RS232 protocol and use it to send RoboCAN commands, but it is much easier.

Personally, I think that the drawing of laptop + adapter should be removed from this particular picture in documentation. It only makes sense as debugging tool and only for Roboteq engineers.