they are drivers for VIA chipsets...since there are a lot of motherboards that use both via northbridge and southbridge chips, they have put them in a "service pack" instead of individually, in order to give you agp, ide, etc... drivers all at once. no via=no need for the 4in1 drivers (and you might only need one of the drivers if you only use a via southbridge, like a lot of the amd ddr motherboards that use the amd 761 northbridge)