it would work perfectly in win98. in the display properties under the control panel, it will show 2 monitors instead of just one, and it will give you lots of options. if you need any help, there was an article about dual monitor on either glideundergroud.com or voodooextreme.com (i can't remember which) about a year ago. just do a search at those sites, and the guide will answer all of your questions.
--jacob