Questions we’d like to address with high-resolution X-ray spectroscopy
What’s the nature of wind instabilites and shocks in normal hot stars?  Can this (class of) model(s) work?
What role do magnetic fields play in hot stars and their X-ray emission? (e.g. do B stars have coronae? How can young hot stars be so hot and bright in X-rays?  How can hot stars with extreme X-ray properties be understood?)
What is the correct shock physics and radiation hydrodynamics at the interface between colliding winds? (e.g. how important is radiative braking? Hydrodynamic instabilities?)