Neither do the '02-up Explorers. A Watts link is used on a solid axle. IIRC, some of the Dodge Durangos use them. It allows the axle to travel vertically, but not laterally like a pan-hard rod does (actually swings in a radius, but the net result is some degree of lateral suspension movement).
Here's a link that shows the difference:
http://www.miracerros.com/mustang/t_suspension.htm
Scroll all the way to the bottom for a simple GIF animation...
The '02-up Explorers use a independent rear suspension that utilizes a conventional double-a-arm or double-wish-bone suspension, and uses the rear toe link to set and lock the rear toe (similar to a tie rod on the front end, except it doesn't move to steer the vehicle). The Explorer uses a coilover shock (not a strut) to support the vehicle.
Another way to differentiate the two is if she has a coil spring, it's an '02-up. If she has leaf springs, she has something before the end of '01. Make sense?