Francois,

> The user selects the fields he want to see, and does a selection like
> ‘customer > 100’ or ‘country = usa’
> He must be able to enter several criteria.
> Preferably using a combobox or listbox

Dream Company's DreamFilterBox is pretty good at that.
http://www.dream-com.com, I think.
Ciao
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_/\/ando