This interface add-on for World of Warcraft is an improved spell book, using a scroll bar, and allowing the collating of all the ranked spells into smaller icons.
Spell Tome does not support toggling of autocast pet abilities as this is not supported by Blizzard's Secure Frames API. Also changing tabs during combat will often not work (also due to Secure Frames API). It's best used for populating your action bars after levelling or respecing, or for accessing rarely used abilities outside of combat.
By default it replaces your normal spell book (P).
/spelltome : Bring up the spell tome
/spelltome pet : Bring up the spell tome on the pet tab
/spelltome original : Bring up the original spell book
/spelltome originalpet : Bring up the original spell book on the pet tab
/spelltome override : Enable overriding the normal spell book
/spelltome nooverride : Disable overriding the normal spell book