This article is from the Final-Fantasy and other Square Soft Games FAQ, by firstname.lastname@example.org (Nick Zitzmann) with numerous contributions by others.
There's a secret Programmer's Room in Final Fantasy IV. Sadly, it was
removed from the easytype version of the game.
At any time that you have access to the Underworld, go to the Dwarf
Castle. Hidden in between the two stores in the castle's arsenal is a
secret cafe. This cafe should be called the Pub Lalli-ho, or Rally-Ho
Pub (which for some reason was called the Cafe HOWDY! in the US SNES
There's a dwarven dancer in here, but he's not the point of coming here.
Look around the eastern wall - there should be a place somewhere in this
room where you can walk forward.
You should find the Programmer's Room from inside the Pub. You can talk
to the programmers here - even fight them! (If you do fight them, try
casting Scan on them to see all sorts of funny messages.)
There is also a Pornography Book ("Smut") inside the Programmer's Room.
You can get it from random encounters with programmer "monsters," or by
searching the bookshelf next to Takashi Tokita. It doesn't do anything