SIS was introduced with the Remote Installation Services feature of Windows 2000 Server. A typical server might hold ten or more unique installation configurations (perhaps with different device drivers or software suites) but perhaps only 20% of the data may be unique between configurations.
The System Installation Service (SIS) was introduced in Windows 2000 Server as part of its Remote Installation Services. Typically, a server would have ten or more unique installation setups, which might differ in device drivers or software suites, although only about 20% of the data would be distinct across these configurations.