Gateway is a part of the Neverwinter website that allows players to access their characters, without logging into the game client, in other words, from their browser or "on the go."
Once logged in, you choose a character, and are shown several options: Character Sheet, Auction House, Professions, Mail, and Guild. Module 1: Fury of the Feywild added Inventory and Zen Market, and module 2: Shadowmantle added the mini-game Sword Coast Adventures.
In Gateway, your character sheet(s) can be viewed to a light degree (stats and equipment, not powers/feats/companions). You may sell inventory for gold/copper/silver, and buy profession assets and resources.
You can read and send mail, but not retrieve or attach items.
You can manage your professions, which is a very useful feature.
On the Guild view you can check the general overview as well as the News, planned Guild events, Member list and the Information site of your guild but at the moment it is not possible to do anything else but review this information.
You can access the Auction House, to trade with other players, using Astral Diamonds as currency. This is useful because you can watch your bids closely while not playing Neverwinter (on the go, or while doing something else on your computer).
- Because of the gateway server's configuration, recent versions of Firefox refuse to connect. This refusal can be bypassed by setting "security.tls.version.fallback-limit" to 1 in Firefox's config.