Tail4Win is a Windows port of the UNIX 'tail -f' command.
Tail4Win is used to monitor changes to files and display the changed lines in realtime.
It can, for example, keep an eye out for certain keywords in a log file.
It is very usefull for monitoring log files of applications - e.g. Apache's error.log and access.log. or IIS,Tomcat,Resin log files.
The main features are:

Main features:
Watch multiple files at same time.
Detect keyword matches, and highlight occurences.
Can monitor files of any size.
Capture and display OutputDebugString / TRACE.
Command line support.