Change the spawn point for LAN players in a single player map

Question

Using Minecraft 1.3, a single player map can be opened up for LAN play.

How do you change where other players will spawn?

I know how to change my own spawn point (by using a bed), but how can I change where other players on the LAN will spawn when they join in?

The original place I spawned in this world is a very long walk from where I am now, and my wife wants to join in without having to walk the whole way there.

Answer 1

Pretty sure you can't do this without using a world editing program. Just have your wife join, teleport her, and have her sleep in a bed.

You can teleport like this:
/tp [wife's username] [your username]

Answer 2

Edit the spawn coordinates in the level.dat file for your World. You can use MCEdit to do this very easily.

As of Minecraft 1.7.2 you can use the /setworldspawn command to do this without using external programs.

Answer 3

There is no way to set a new spawn in smp