Returns information about the skill requirement for a trainer service. Often used for trade skill recipes: e.g. Netherweave Bag requires Tailoring (315).
See also Trainer functions.
index- Index of an entry in the trainer service listing (between 1 and
skill- Name of the required skill (
rank- Rank required in the skill (
hasReq- 1 if the player has the required skill and rank; otherwise nil (