Search history allows users to re-run a search from a drop-down list. After completing your search, on the top left of page use the drop-down list in "Search History". You will see the previous searches and next to each search term will be the respective Search Tab, e.g., Index-Catalogue, eTKeVK2, LocatorPlus, PubMed, or PubMed Central. Once you select from the drop-down list, the search will automatically re-run. When you exit out of IndexCat™ all search history will be lost.