Oramai ho installato win2kprof, ma ho trovato un interessante tool su securityfocus.com per controllare i processi che ascoltano come daemon su una porta che funziona su win9x e NT:
Descrizione (dal sito)
This is a very useful tool that lists the current processes in your Windows system and which ports they listen on. It is written to work on Windows NT and Windows 9x. There have been some stability problems on Windows 9x, but they seem to have been solved now. On Windows NT, inzider is unable to check processes that are started as services.