I suppose you really are new to this. There's a beginners FAQ that I ran into a while back
here that seems accurate enough. It's more of a general thing than how to do specific things. But really, there are a great number of things and no one uses them all.
ACT is not a UI like in WoW. No such thing exists in EQ2. EQ2 generates log files of all information that would possibly go into a chat window... whether it does visibly or not. ACT reads that text file and parses it into usable data.
That usable data primarily is viewed within ACT. There are a multitude of ways to export that data however. You can place summaries of the data into the clipboard. You can create social channel macros to display those summaries into specific chat channels instead of pasting the clipboard contents. You can display mini-parse windows that take up less space than ACT to display over a windowed screen of EQ2. You can automatically create HTML files to view in EQ2's FireFox embed. You can turn ACT into a webserver to view data in EQ2's embedded FireFox browser. You can export data to database servers, web servers etc.
You can read the logs in real-time... read them after your EQ2 session, read old logs from months ago...