The idea: you have friends on a system, and you want to know when they log on and off when you're logged on. what's more, maybe you're tired of throwing together crappy/clunky who(1)/w(1)/finger(1) commands in obfuscated shell/perl scripts that only half do the job anyway.

wuzzah is a program that selectively scans a system's utmpx records (where logins are stored, among other things), keeping an eye out for your friends logging in and out, taking customizable actions on events. wuzzah is small, fast, efficient, and written in C.