sentences:  Sandstorm's major products were PhoneSweep, the first commercial multi-line telephone scanner (a war dialer), introduced in 1998, and NetIntercept, a commercial network forensics tool, introduced in 2001.Designed as a second-generation network analysis tool, NetIntercept operated primarily at the level of TCP and UDP data streams and application-layer objects they transport.In 2002 Sandstorm purchased LanWatch, a commercial packet-oriented LAN monitor originally developed by FTP Software.