Press ALT+SHIFT to show the UsedInRecipe tooltip for all toons on this server
There is no internal database. It will create the database from known recipes on all your toons.
Clam Meat showing alts
Press ALT to show the UsedInRecipe tooltip addition
Press ALT+CTRL to show the UsedInRecipe tooltip with items used in the items used in the items .....
Shows only tradeskills that character knows