How to get the difference between two lists?

[Monte Goulding]

> Ken (and all the other ingenious people), you have something against the 
> "intersect" command?
>
> Convert both lists to arrays and intersect them leaving only the 
> non-common elements.

My understanding is the intersect command creates an array with only common 
keys. If there was an inverse of the command it would be perfect as you say.

Cheers

Monte