The pull down menu at the top of the pages guides you to general drug resources such as News and Features, NLM resources, resources by category, and other government resources such as NIH and FDA. You may use whatever features are available at a particular site, which will open in a separate window.
The search box in the middle of a page uses the drug name you enter to simultaneously search a selected group of these resources for information about that drug. You may also search the category of the drug. Both drug name searches and category searches will give you suggestions for a search as you type using Ajax technology. These suggestions will start after the first 3 characters in the drug name, and the first two characters in the category.
The results page lists all available resources for a drug, and will open each result in a new window.