Oh, *nice*...the one thing that was broke (IMHO) re T4Win has been fixed (namely, the ability to add fleetmaps/detect fleetmaps; pretty much *all* the Motorola systems around here are either type I or type IIi, both requiring fleetmaps). :3
It's just one NAC code for the whole trunked system.
From the main menu, you'd select "View -> Properties" to see things like Motorola Connect Tone or P25 NAC code.
Not all that interesting; displaying NAC codes for P25 conventional will be more useful - this will require scanning the conventional channels - and probably a different program to display them.
Should you need help on NAC with conventional channels...
Pretty much *all* the monitorable APCO-25 traffic around here is nontrunking (Indiana's STARS system is probably not going to be monitorable for some years yet in Louisville; I think the counties around the Louisville Metro area are among the *very* last to be targeted for transmitters!) and I *am* capable of monitoring several of the KYSP APCO-25 conventional stations in my location.
(Yes, this is an explicit and blatant beg to be included in alpha/beta testing. Heck, I'm a professional tester in RL :3)