Messages along the ram track (grape vine?)
someone requests the tram by triggering the track near them. This sets itself as the destination then finds all exits with a track in them and changes their state in some way.
Tracks with a changed spate then search for exists with tracks in them, and do the same.
This raises the question of a new field:
- objects having a switch variable - they dont process code if switched off.
switch $tactor off