anti_join

I am trying to find information about setting the parameter always_anti_join, and the effects of the different values. Does anyone know or know where to look?

http://technet.oracle.com/docs/produ.../ch17.htm#1494
http://technet.oracle.com/docs/produ...ints.htm#16995
http://technet.oracle.com/docs/produ...mops.htm#27614
http://technet.oracle.com/docs/produ...mops.htm#36697