Since your browser can store only a limited number of URLs in that box (18 in Navigator 4.5, 25 in IE 5), a simple way to "fill up" the box is by typing a single character and then pressing
A quicker way, in Navigator 4.5, is to select Edit-Preferences. Select Navigator on the left and in the box on the right, select Clear Location Bar-OK. If, when you reload Communicator, your URLs reappear in the drop-down box, the browser is pulling them out of the Registry thanks to some old installation of the browser. From Windows' Start menu, select Run, type regedit and press
In IE 5, select Tools-Internet Options and under the General tab, click Clear History. To prevent Explorer from storing any URLs - in case you want to keep your boss from finding out which Web sites you've visited at work - set 'Days to keep pages in history' to 0 and click OK.