Vista - History Deleting vs. Parental Controls

I understand that Vista provides views of account activity through the use of
Parental Controls, but what if my son continually deletes his browsing
history and cookies after he uses the computer? Will I still be able to view
his activity accurately through the parental control report?

Hello tonikart,
Forgive me to say this," isn't this a question you can find out yourself by looking at the activity report ?" OR, maybe YOU are the son ??