What scripts can't do

Scripts are very powerful tools that can make complex decisions based on a number of criteria. Because of this power, Blizzard has limited the types of things we're allowed to do with them in order to keep macros and addons from taking actions that should be controlled by the player. I'm starting this section with what you can't do because I don't want you to get your hopes up. While scripts do remain useful for quite a few purposes, you cannot use them to cast spells, use items, change your action bar page or affect your target in any way. You are limited to using the "secure" commands already shown for those tasks.