Lennie,
Here are some links to help you with your research. There are several other options out there, but this will give you some good basic information:
Randonnee alpine touring "AT" ski gear
http://www.wildsnow.com/articles/at_...ticle_big.html
Alpine Touring (AT, Randonnee) Ski Equipment - The Backcountry Basics
http://www.wildsnow.com/articles/at_...t_ski_tips.htm
Frequently Asked Questions (FAQ), tricks, and tips Dynafit Tourlite Tech (TLT), Comfort and Tri-Step randonnee "AT" ski bindings
http://www.wildsnow.com/articles/dyn...faq-index.html
Fritschi Diamir Freeride, Explore, Express Information Index
http://www.wildsnow.com/articles/fri...ngs-index.html
Frequently Asked Questions (FAQ), tricks, and tips
Naxo NX01 and NX21 randonnee "AT" ski bindings
http://www.wildsnow.com/articles/nax...faq-index.html