Object TRACK(X,K,FIBRE1,FIBRE2)

• Here one specifies the initial FIBRE in FIBRE1 and the program tracks to the front of FIBRE2
• FIBRE2 is optional. If not there, tracking continues all the way to the front of FIBRE1 or to a terminated FIBRE pointer.

Warning: this routine could easily go into an infinite do-loop. Advanced users can also create strange topologies which will allow transfer from one layout to another using this routine.