I stand corrected! I think I misread your first post.
- First following the tangent / wrong thread: You can join a jabber server, and you should be able to see any other XO's that may also be connected in the Group view.
- If the mesh interface is up, you should be able to see other XO's in mesh range in the Neighborhood view.
Seeing "mesh" nodes is like seeing wireless "infrastructure" base stations, or other "ad-hoc" nodes. OLPC is based on the 802.11s standard
which allows "ad-hoc" wireless nodes to forward packets from along, as opposed to just being a point-to-point direct network.
The "emulated wired connection" is probably an 802.3 ethernet emulation. You'll probably not be able to create a 802.11s device over this emulation. You may indeed need to emulate a wireless 802.11 and install a mesh driver on top of that.