(In the context of the GM, but this is a very general question).
In sentences like Who saw whom?, should the VP be licensed by a simple Head-Comp rule? What about the sentential force, does it make sense to talk about sentential force for a constituent? (It is called sentential after all, so perhaps not?)
In other words, in a constituent like saw what, do I only need to worry about NON-LOCAL.QUE value and nothing else?..