What MBF friends can alert enemies on being sighted?

[printz]

If you give an object the FRIEND flag, what are the requirements that enemies are alerted upon seeing it? Is there a hardcoded monster list (i.e. only monster Dehacked slots will alert enemies)? Do friends have to COUNTKILL and have sizes larger than 0? I tried looking through P_LookForPlayers and P_LookForMonsters, but this test seemed to be buried deeper into the code. Does Eternity still have this hard-coded, if it is so?