Regular chat. Anyone nearby you in the same channel can see this.

Shouting. Anyone in your current map can see this, regardless of channel.

Party chat. All party members will see what you have said, regardless of channel or map.

Guild chat. All guild members will see what you have said, regardless of channel or map.

Whispering. Only the specified person you're whispering will see it.

Replying to a whisper. Instead of having to type "/w [Username]", /r allows you to reply the last whisper that you received.

To block an user. Blocks whispers, trades, normal chat and shouts.

To add an user to your friends list. Press F to open your friends list.

To add an user to the Guild you belong to. (You MUST be a Sub-Master or Master from the guild, or equivalent.)

To add an user to your party. If no party exists, it creates one.

Invites an user to trade with you.

Leaves the current party you're in.

Locates shops with specific characters in your command. Ex: "/shopfinder [Dex]" will look for all shops with the word "Dex" in their names.