Improved Precise Shot and Seeking weapon ability

AC part is obvious, but how Improved Precise shot feat is supposed to work vs magical concealment? Does it negate miss chance from magic spells like Blur (20% miss chance), Blink (up to 50%), Darkness (20%), Displacement (50%), Fog Cloud (creatures within 5 feat have 20%, further away 50%)? I would guess it negates Blur, Darkness and partially Fog Cloud, while Seeking ability on magic weapon would negate all of them. How is it implemented in ToEE?

http://www.d20srd.org/srd/feats.htm#improvedPreciseShot

http://www.d20srd.org/srd/magicItems/magicWeapons.htm#seeking