Paus is all about controlling stuff with easy perl-scripting. The system is event-based, so all the modules that the core communicates with will be sending and receiving events. When you connect a switch to the input of the I/O board and you flip it, the IO module will send an event like "IN3=1" to the core. The core will then call the approriate "handler" for the event called "IN3", and in this handler you can put your perl code. For example S("IO","OUT3","1") to activate output 3 from the IO board. Because of this event-based design the possibilities are endless. :)