/afk Making tea
/dnd
/onlineSets your status so guildmates see why you are not answering. /afk takes an optional message, /dnd suppresses incoming whispers entirely, and /online clears both.
The friends-list version of the guild jump. Both commands respect instance and campaign rules, so they will fail politely if the target is in a dungeon or a locked Cyrodiil campaign.
/jumptofriend @AccountName