Unlock

Overview
In Guild Wars, "to unlock something" means to make it available for your PvP characters. Currently, you can unlock skills, runes, and weapon upgrades. You can unlock via either PvE or PvP.

Unlock via PvE

 * Learning a skill (regardless of whether it's from a quest, skill trainer or captured from a Boss) will unlock the skill.
 * Identifying a weapon upgrade or rune from loot will unlock it.
 * Notes:
 * You do not unlock things that you buy, only things that you identify by use of an Identification Kit. This means that if you buy a weapon upgrade from a fellow gamer, you will not unlock it, unless it is still "unidentified".
 * Buying a rune from a Rune Trader will not unlock it. Runes can only be unlocked by using an Identification Kit on salvage items such as Ettin's Pauldrons or Seeker's Vests. If you salvage the salvage item before identifying it, you will receive an unidentified rune, which can then be identified to unlock the rune.
 * When you identify a weapon upgrade with a higher bonus than you have previously unlocked, you unlock that upgrade with the newer, higher bonus. For example, let's say you have never identified any swords before and you identify a sword that turns out to be a "Fiery Fellblade of Enchanting". This will unlock "Fiery Hilt" and "Sword Pommel of Enchanting" with a particular bonus (10...20%) to enchantment duration. If it turns out to be 12%, then your PvP characters will have that pommel available to them with the same 12% bonus. If you later identify a sword with a higher bonus, you unlock the higher bonus.

Unlock via PvP
You can trade your Faction points at a Priest of Balthazar to unlock skills, runes and weapon upgrades.