Integrated Library Systems are also known as Library Management Systems.
An Integrated Library System (ILS) is "a multifunction Web-based multimedia content information management system, generally built on a standard relational database structure."
-Deddens, Marcia. Overview of Integrated Library Systems. University of Cincinatti:, 2002. 20 July 2010. http://net.educause.edu/ir/library/pdf/DEC0201.pdf
This powerpoint talk has obvious educational intentions though it is not a product of Temple University. It goes indepth on the different parts of an ILS, relevant history, and ILS providers. This is an easy way to gain knowledge of ILS jargin.