Switching characters while one is busy

Account

• Play as and Create another character work while your other character has tasks queued, and its queue keeps running
• Your other character's line on the Account page says what it is doing and when its queue ends, or that it is idle, and keeps up while you watch

Auction house

• Your two characters can trade with each other

Notifications

• A notification about one of your characters no longer replaces one about the other

Reference

• Trading says your other character trades with you