Editing WoW:Useful macros (section)

=== Multi-Purpose Party/Solo Attack Spell ===
 #showtooltip <spellname>
 /cast [harm] [@targettarget, harm] [@focus, harm] [@focustarget, harm] <spellname>
* Use: Cast an attack spell with limited need to change target. Is not useful for AoE spells as they often do not use a direct target.
* Note: Replace <spellname> (including the <> signs) with the name of the ability you want to cast and don't forget to replace both places <spellname> shows up.
* Credit: Wu of Kael'thas
* Tested and working in 4.0.6

This macro works a little differently than some others, as it does not perform a change to your playstyle, but merely limits mouse clicks (if desired) and encourages coordinated assaults. This casts a spell or ability on a priority based target. If you are targetting an enemy, it will cast at your target; if you are targeting a friend who is attacking a mob, it will cast at their target; if you have no target, but your focus is a mob (i.e. boss fight), it will cast at the mob; and finally if you have no target but your focus is friendly and has an enemy target, it will cast at the enemy.

This has been particularly useful for our guild, allowing us to easily coordinate assaults without the requirement for mad AoE damage. Our Off-tanks typically select the main tank as their focus, while our DPS (ranged and melee) select their particular tank or off tank. When the focus changes targets, the DPS are immediately updated to the new target. Quite Handy! For soloing or special circumstances where each person needs their own target, the macros don't hinder us in anyway because it chooses OUR target first.

;Example
 #showtooltip Fire Blast
 /cast [harm] [@targettarget, harm] [@focus, harm] [@focustarget, harm] Fire Blast