Larry,
If you are just doing maintenance it does not matter as long as you're not doing any switching. you would not be messing around during a session unless there is a problem.
As far as FIFO or the other one I messed around with them but I don't use them so I don't sorry. From what I have seen the program keeps track by car number I don't know if anything else was built in. May be Dan might chime in and correct me if I have missed something.
TTFN
Matt Greenwood
Cascade Rwy
Grant NE
