Summon is the Library's Google-like search tool. The difference is that Summon only searches the Library's collection. If your research topic is interdisciplinary (meaning your topic is not only related to health informatics but other areas as well) this can be a good place to start your research, and it will instantly give you a sense of what the library has on your topic.
Some advantages of Summon over Google Scholar:
Selected journals to help you with your research.