SL4NT is an application which implements a syslog daemon. The purpose of a syslog daemon is to listen for incoming syslog messages from syslog senders - like Unix hosts, routers, firewalls, etc. - and then decode and process the messages for logging and notification purposes.
A Single User license gives you the right to use SL4NT on one computer, the number of clients is not limited.
A Site license covers the use of SL4NT on an unlimited number of computers in a single organization within an area of up to one hundred miles (160 km) in radius.
A world-wide license covers the use of SL4NT on an unlimited number of computers in a single organization.