Multiple Ktuners and one laptop

[7thGenLucifer]

Hey there,

Could you lay out the steps of the proper way to use multiple Ktuners?

I'm being asked to help set up and tune my buddy's Civics and Accords.
I don't want to screw my laptop as I use it for my car.

[KTuner]

Plug the device into USB. Connect with the software. The end.