I opened the Usage - by User view in my log.nsf and I see an action button on the action bar labeled “[Whack Body Data]”. When am I supposed to use this? 
Looks like one that Lotus left behind in the template.
Subject: Its there in mine too.
Subject: *Check the signature and see who last modified the view. I doubt it was IBM
Subject: Nope, signed by Lotus Notes Template Development/Lotus Notes, view Usage\By User.
Subject: RE: Nope, signed by Lotus Notes Template Development/Lotus Notes, view Usage\By User.
I found that the code behind this button erases the session activity data in the log documents.
Subject: Same here! 
Subject: When am I supposed to [Whack Body Data]?
show me the template with IBM’s signature on it. I can’t find that at all on 6.5 and 6.5.1.