could someone please explain to me wth a cord is and how to use it?

a cord is cordinates, usually used in image mapping, well with cords u do like exact spot where something is located. U can use it and make the spot have like a link.

For image mapping, here's some tutorials:

Rectangular Maps:
http://www.createblog.com/forums/index.php?showtopic=6602

Polygon (irregular) Maps:
http://www.createblog.com/forums/index.php?showtopic=6618