Token - Ajax

Hi

I would like to know what token number is to cck?

Is unique? Because my users receive always the same token number in the form (same form)?

Does Make more sense if cck forms have unique token number everytime? If page reload another token number must be generate.

I know same cck fields will have problems like imagefield (because have upload button that reload the page)

but Will be more easy implement Ajax Solutions and more consistent.

How can I make unique token to every form in cck?

Regards

Mario