2 video cards for 2 monitors

I am continuing to work on building a new system, and something I have considered is going for a dual monitor setup.

The video card now in my Win98 system is a Matrox Millenium *200 AGP with 8 megs. Not the greatest card, but it does meet my needs.

I do have an extra PCI video card to use for the second monitor. It is an ATI All In Wonder, their original with Rage II and 4 megs. I also have an extra monitor on hand.

The Win98 help says I just put in the other card and install drivers. But is it really that easy? Risk of conflict is low because the ATI card uses no IRQ at all and I don't have a COM4 (a conflict that many ATI cards present). So aside from conflicts, what other pitfalls are there when going for dual monitors? And any chance the TV features would still work, even if on the second monitor only?

I already tried asking ATI's tech "support ", but they just sent me URLs to FAQs that don't even address dual monitors.