People thought this tutorial but not tried yet because I am on my computer without RF.
Testem and speak what happened.
After trading the items you want to trade from player a to player b. Log out player A. Let player B stay online. You must also be the race leader or know the race leader. So this needs his cooperation. Let him target a UMT of another race and your server will automatically get closed. A rollback will happen and player A and B will have both of the items. Instant dupe
hugs.