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From Diablo Wiki
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* The '''1234''' buttons cast whichever skills are mapped to those buttons. These are generally
** You may also map potions, elixirs, or scrolls to the 1234 buttons.
* The '''5''' button is reserved for a potion; healing by default. If you use up all of whatever type of healing potion is mapped to the 5 button, another quality of healing potion (from your inventory) will be automatically mapped to 5, for your convenience.
Casting a spell or skill from the 1234 buttons works just like casting it from the mouse button. You could, in theory, play entirely with the 1234 keys, only using the mouse to target. Generally, players put support skills on the 1234 buttons. Summoning spells, buffs, debuffs, and so forth. Direct attack skills can be mapped there as well; it just takes some practice to get used to casting these with keyboard buttons, instead of (in addition to) the mouse buttons.
