There are two ways to view program material from Vegas:
(1) For SD you must use an Digital-to-Analog firewire converter such as the Canopus ADVC-110, ADVC-300, ADS Tech A/V Link, etc. Vegas doesn't support any other way of viewing SD except via firewire. Even an old camcorder with passthru will do.
(2) For HD you can use your Windows Secondary Monitor to display on your second LCD or even to an HD TV using a DVI-to-HDMI cable. You can also use an AJA Xena LH, LHe, LS, or LSe card. Those are pretty much your two HD options for preview.
Of course you can send HD out the firewire but it will be downsampled to SD.
~jr
www.johnrofrano.com
www.vasst.com
