Whoa.......and I mean whoa.   Thanks for looking it up and letting me know.  With all that kind of data, I won't touch them.  I'm guessing most of them are obsolete, but which ones?  I won't rock that boat unless I know for sure. 
ANDs, I wouldn't doubt I've got some sessions that are open for edit.  Why......I don't know.   I use the sessions for testing things, and I know they pile up. 
Thanks, much appreciated.