Question 1: Not sure...
Question 2: See:
http://seer.entsupport.symantec.com/docs/287894.htm
http://seer.entsupport.symantec.com/docs/284648.htm
http://seer.entsupport.symantec.com/docs/287547.htm
http://seer.entsupport.symantec.com/docs/293479.htm
Cheers