[ns] Movement of nodes should be modifiable during runtime of an ns-2 simulation

[Schuenemann, Bjoern]

Dear all,
 
I'd like to make a simulation with ns-2 where the movement of the nodes is 
modifiable by another program during the runtime of the ns-2 simulation. How 
could I realize this? It seems that modifications of trace and movement files 
are ignored by ns-2 after the files are read in by the TCL script.
 
Thank you very much for your help!
 
Regards,
Björn