[NTG-context] back to the roots: command vs switch

I'm taking a long tour in the wiki (congrats for the work). It has reminded me that I don't know what's the difference between command and switch. Can anyone bring me to the light? Thanks a lot -a- Andrea Valle DAMS - Facoltà di Scienze della Formazione Università degli Studi di Torino http://www.semiotiche.it/andrea andrea.valle@unito.it