I just got a reply to a Sage question about Arcane Archer abilities. There was a thread on it a while back, but hell if I'm gonna take the time to dig it up. 
My text is plain, the Sage's comments are in bold.
Seems sensible to me. Comments?

My text is plain, the Sage's comments are in bold.
Good morning, sir!
I am a bit confused about the powers of the Arcane Archer prestige class-- specifically, the Phase Arrow and Seeker Arrow powers.
Since the Seeker Arrow can turn corners, it seems that the archer can fire at a target outside her line of sight. Is this correct?
Correct.
If yes, can she fire at a target whose location she does not know?
With a seeker arrow, yes.
For instance, if she sees an orc run through a door but does not know where he went afterward, can she still fire a Seeker or Phase arrow at him?
With a seeker arrow, yes.
The description of these powers states that the archer fires the arrow "at a target known to her within range." Does that mean she only requires personal knowledge of the target?
Yes. The arcane archer must have seen the target or be able to specify the target in some exact way. Such as "Grodnard the orc" or "the first orc the arrow reaches."
If the archer knows what the king looks like, can she stand outside the castle and fire a Phase Arrow at him, letting the arrow figure out where exactly he is?
A phase arrow travels is a straight line, and the arcane archer must aim the arrow at the correct location. The arcane archer could use a seeker arrow to shoot the unseen king, though.
Seems sensible to me. Comments?