Realtek AC'97 Drivers is a collection of compatible drivers that will be installed on Windows systems with PC hardware that includes all RealTek audio chip-sets that use the ALC series from ALC101 to ALC861. The built-in Realtek chipset is included with certain motherboards to provide sound. This driver package includes a process of configuring the driver application that validates that a compatible piece of Realtek audio hardware is installed on the PC as a hardware component, and then the driver is installed. RtlRack is installed for Windows 98 / Me / 2000 / XP systems while AvRack is installed for Windows 95 / NT4 systems. The Realtek Sound Effect Manager is also installed.