IE8 gives you the ability to change the active search provider without modifying which choice is your default option. This feature is useful if you want to temporarily utilize another one of your installed search providers. To do this first click on the Search Options arrow, located in the upper right hand corner of your browser window next to the Instant Search box (see screenshot above). When the drop-down menu appears, select the search provider you wish to make active. The active search provider is noted with a check mark next to its name.
Please note that when Internet Explorer is restarted, the active search provider will revert to the default option.