Also, I'll add that the "Expressions" page in the CHM html help file might help. It outlines a lot of the logical comparators, and lists many various examples. This section may be in the original help doc as well, but I don't have it handy to check.

Newest CHM files can be found at link below...

http://www.kixtart.org/forums/ubbthreads.php?ubb=showflat&Number=202858