Not just Trekish, there's a fair body of cross-time sf out there and a number of them do have means of tracking people back across the lines, though sometimes it ends up being more dogged police work by those policing the travel between lines (H. Beam Piper's "Paratime Patrol" stories are a prime example, though there's a good duology by Andre Norton, too - and those are just off the top of my head).
chuckle Just think, if his parents had been big Shakespeare enthusiasts, he might have been Prospero.
Author's response
Oh sure, it's just that Trek had people tracing resonances every week for pretty much every reason...
Like I said, it's doable, just not my intention to do, I mean where would Harry learn to....
Ah crap, you keep doing this to me, ok, the story is now a possible trilogy
1. The Distaff Side
2. Neville Longbottom and Potter's Army
3. Finding Harry.
Damn it damn it damn it. These damned plot bunnies better leave me alone long enough to finish the stories already on tap.
This is all your fault.