A portion of the free full-text articles reside in PubMed Central (PMC). PMC is NLM free digital archive of life sciences journal literature.
The full-text in PMC can be viewed as HTML or PDF.
The video illustrates the directions that are on this page.
This video can be seen directly at http://www.nlm.nih.gov/bsd/disted/pubmedtutorial/videos/050_030.mp4