llSetObjectDesc- getting one object to change this in another via chat.... is this possible? I need to automate a switching RR system for route setting, getting the signals to alter the description of the loco so it follows certain named track guides. So in essence we have a manually set signal lever connected to a signal post -np so far, in the track is a prim that needs to listen to this change and alter the ObjestDesc of the next loco along so it follows the correct route at the points (turnouts) via pre named block track guides. Just this part of the scripting escapes me, the rest is working:) tyvm!