CACHE - Chicago Area Computer Hobbyist Exchange, CATUG: Chicago Area Timex/Sinclair Users Group, CCS: Chicago Computer Society, Chicago PHP Users Group, CHIUG: Chicago Area Informix Users Group, CNUG: Chicago .NET Users Group, COUG: Chicago Area Oracle User's Group, CPUG: Chicago Palm Users Group, CSA: Chicago Software Association, CSTUG: Chicago Smalltalk Users' Group