It has to be generated.
Great Doubt: Practicing Zen in the World by Boshan Yuanlai
Talks by Jeff Shore on Boshan's text: Part 1 (PDF), Part 2-3 (PDF)
The Chan Whip Anthology by Yunqi Zhuhong
Sure. How else could it be?
And by functional do you mean causally effective? If so, what's wrong with saying that phenomena are conditional?