A cookie is information sent by a Web site server to your computer. TOXNET creates session cookies on your computer. These cookies last for the duration of your connection to TOXNET. The cookie contains information about each search so that previous searches can be displayed. TOXNET itself does not keep track of what searches you have made. It only has files listing the results of those searches. These temporary files are kept for no less than one hour and for no more than two hours. Each time you request a record from a search request, the results file is given a guarantee of one hour to live.