The iHOP webpage enhanced by the iHOPerator user-script. The iHOP webpage after it has been enhanced with the iHOPerator user-script. Compare with Figure 1. The Web page now includes a tag cloud composed of MESH terms from abstracts associated with the gene Brca1 in mouse as well as a panel of controls for manipulating the new visualization. The number of terms used to build the cloud, the scale of the fonts used, the presence or absence of the cloud on the page, and the actions taken when the user clicks on an element of the cloud are all under the user's control.