I learned a lot about Oracle and HPUX while I worked there. I even worked with an IBM 4381 mainframe and got data from it into databases.
CID investigation showed everything I did, from accessing the database I should have, to downloading MSAccess updates from Microsoft, to Oracle and IBM knowledge bases, and other computer related web sites. No misuse of the Internet was shown. I think that Duffer guy got investigated himself for wasting the CID's time. :)
I had two computers and the one I was doing the downloading from had the browser open so I could see the status of the download and start it again in case it timed out. I was working on the other one, and monitoring the download on the first at the same time.
Heck I even learned Clipper, not that it is of any use to me now or in the future. :)