Sets your designated home (see "help home") to be the room you're in now. If the current room wouldn't allow you to teleport in, then the `@sethome' command nicely refuses to set your home there. This avoids later, perhaps unpleasant, surprises. Additionally, your home must be a room that will allow you to stay there. Rooms which you own will do this, as will rooms to which you have been added as a resident. See the @resident command for help on adding someone as a resident to a room you own.