To date guidance from Treasury to state HFA's for the Hardest Hit program has been in the form of administrative guidance and FAQ's. In my prior HUD career "administrative guidance" would be equivalent to "HUD handbooks" that had a different legal weight than regulations that had undergone a more rigorous public rule making process.
For ongoing use in the Hardest Hit Program I thought it would be useful to provide links to the actual TARP statute and the TARP regulations from Treasury:
PL 110-343 , Emergency Economic Stabilization Act of 2008.
31 CFR Part 31, Treasury regulations for the TARP program.
Originally created and posted on the Oregon Housing Blog.