Tracing is written to the console window and also to a file called fsscreen.lst in your Fileshare directory. For each request, you see the user identifier, opcode, requested filename, and file status bytes of the reply to the user.
You should normally delete fsscreen.lst before starting a Fileshare server, otherwise your new trace output will be concatenated to whatever is currently in the file, which can be confusing when trying to track down problems.You should use this facility only as a diagnostic aid, because it can degrade performance. Press F2 again to turn it off.