ProQuest Notice:

We were unable to complete your search.  Please correct the problem and try again. The problem is immediately before or after the ^ character as shown here:
(Peer^+to+peer+file+sharing)
Instead of "+" you should have one of the following

- a number
- a search operator
- a search field
- the name of a month or season
- a word
- a right parenthesis
- a quote mark (")