This works the PC version of FFXI using a Gforce graphics card. Since it’s based
on flaws of the graphic engine, i cannot say wether or wether not it works on the
console version or other cards. It basically allows you to target things through
solid objects like walls or doors. It works best if the wall/door etc has some
kind of corners. Even tho i got it to work on a plain and smooth wall, it is
easier the other way.
Place your back as much in the corner as possible
go into 1st person view
turn your field of view as much left/right as possible
slowly turn your character to the left/right
By doing so you should reach a point where you can see through the object. All
objects, walls and doors ingame are only visible from the sight player are supposed
to be on. So by looking through the wall with this method, you will also look
through all other walls in your direction that do not face you with their ‘visible’
side.

use the nromal targetting methods (cycle target/click with mouse etc)
You can also lock on to selected targets.

NOTE
Do not move your char in any direction while looking through the wall or having a
target locked. The game engine places the camera at the front of your model. By
forcing the front of your model behind your back, the game thinks it’s behind the
obstacle letting you look through it. The moment you move your model will be aligned
with your field of view playcing your view in front of the obstacle.

Castle Oztroja
This is where i discovered the bug. Everyone knows the door in the coffer area that
can only be opened by lighting a torch (only THF can solo that and live) or a lever
behind the door. Use the trick in the right corner of the wall (when facing it, the
corner where the lever is). When you look through the door target the lever and lock
on to it. If you are far enough in the corner, then you can use the lever now to
open the door. If you get the ‘target out of range’ error, you need to do it again
getting closer to the lever (more into the corner). You cannot use the lever without
locking on to it because of range issues.

Garlaige Citadel
Oh be thee damned, Banishing Gate. Old Two-wings and Skewer Sam can easily be
solo’d. But whoever tried to camp them encountered the problem, that you cannot
reach them without passing gate#1. . .and you usually don’t intend to drag 3ppl
along to camp them. So use the trick to look through the gate and target something
behind it (prefereable a skeleton since they dont move far). Lock on to the target
and wait. When Sam or 2-wings passes the gate, quickly release the target and switch
target to the NM (make sure to look to your utmost left/right to be able to watch
through the wall to target). Now lock on to the NM and move to the front of the door
and claim the NM with any ranged spell/ability/attack/job ability. Even though you
cannot look through the gate and usually can’t target through it, you can attack
through it