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This is what the items in your bags look like that Who Knows? has identified that one or more of your toons can learn or will be able to learn. Looking at the item's tooltip will tell you who can use it.
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Showing any toon you have that has the profession needed
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When viewnig a tooltip, and toon or alt in your account that has the right profession, get an instant view of the status - no more guessing!