I looked at the wiki [specifically, getNearestTarget] and I found something:
i6 and i7 are "excludeVirtual" and "excludeNormal"
What are these?
"exclude" i assume means "NOT" ...
But what is a "Virtual" target?
What is a "Normal" target?
Some units have virtual particle(s) to simulate particle/weapon interactions. This technique is often used to simplify coding. Flying omni's are destroyed when their virtual particle is destroyed.
Ship hull is also virtual, I understand.