2 questions regarding double weapons in 3.5 D&D:
First off, you enchant each side separately, right? So, if the Parrying ability is put on one side, and Defending is put on the other, can the wielder use each side at once, or only on the main hand side?
Secondly, when you designate one side of the weapon as being the main hand, and the other as being the off hand, can you change that? And how often? To illustrate, if I have shock as the main attack on a two-bladed sword, and thundering as the off hand attack, can I switch it up, and does it require an action?