|Developer(s)||Systat Software Inc.|
13latest_release_date = 2009
SYSTAT is a statistics and statistical graphics software package, developed by Leland Wilkinson in the late 1970s, who was at the time an assistant professor of psychology at the University of Illinois at Chicago. Systat was incorporated in 1983 and grew to over 50 employees.
In 1995 SYSTAT was sold to SPSS Inc., who marketed the product to a scientific audience under the SPSS Science division. By 2002, SPSS had changed its focus to business analytics and decided to sell SYSTAT to Cranes Software in Bangalore, India. Cranes formed Systat Software, Inc. to market and distribute SYSTAT in the US, and a number of other divisions for global distribution. The headquarters are in Chicago, Illinois.
By 2005, SYSTAT was in its eleventh version having a revamped codebase completely changed from Fortran into C++. Version 13 came out in 2009, with improvements in the user interface and several new features.
SYSTAT was also a command on the DEC TOPS-10 and RSTS/E computer operating systems by which one obtained the current general status of the running operating system. The commands showed the logged-on users, processes, I/O, and other interesting system management information. This command was parodied by the Firesign Theatre in their album I Think We're All Bozos on This Bus.
systat or Active Users is a simple Internet protocol ostensibly useful for "debugging and measurement". A connection to port 11, by either TCP or UDP, elicits a list of users currently logged into the system. Though it remains an official Internet protocol, its use is considered a security vulnerability.