There are several solutions if you want to track the activity of your users (hope I guess well what you want to do...).
- search for "folder watchdog" on Google
- special software which can record activity in your computers (there are a lot of things here which can be discussed, including how designers are feeling when they are "hunted")
- in C:\Documents and Settings\user_name\Local Settings\Application Data\DassaultSystemes\CATTemp\ there are some log files (depend on your CATIA installation)
- check Statistics in Tools-Option-General
- install a PDM system....
Regards
Fernando