The ACM DL is a vast collection of citations and full text from ACM journal and newsletter articles and conference proceedings.
Citations consist of title, author, publication data, and, when available:
citings (where the paper has been referenced by other papers)
references (by the paper to other papers)
index terms from ACM's Computing Classification System (CCS)
reviews from ACM's Computing Reviews. To connect to the collection you have to use the University's IP range.