Well I'd like to know as well - we hit a great b2b set with my friend recently but everyone has been using his own usb drive so the history recorded only the "local" tracks so we are doomed...
I was thinking about exporting the library as a xml and merging the tracks manually from there but haven't tried yet....
The CDJ's shoudl be storing the track name etc. in the history from all the linked players to all the usb drives on the network even the files are not in the local library.. The metadata are flowing on the dj link anyway so its only the cdj lazyness that it doesn't pick up and store them....
....but this will never happen....- what a shame...