Here's what you are looking for:
http://forums.ddo.com/showthread.php?t=59790
It may be a little dated but has a wealth of info on what hits what when and how.
I have this printed out and refer to it often.
Here is a bit from that post on what effects both weapons:
Shatter - increases chance to Sunder*
Vertigo - increases chance to trip*
Weighted - % chance to stunning blow*
Seeker - increases chance to Confirm Critical hits*
Tendon Slice - % chance to Hamstring*
Backstabbing - (+) Bonus to attack and damage while sneak attacking (damage is at 1.5x to hit bonus)*
* These effects apply to the character, not just the weapon. Items in your off-hand effect your main hand as well and vis versa