same as above

AFAIK an API monitor just tells you what API's each module is using (hence the name ;-) )

Filemon/Regmon are completely different tools....actually if Sysinternals made an API monitor, it would probably be called Apimon :-)

You can't really say its "better"...They are totally different, and serve different purposes

Regmon: Lists what parts of the registry the program modifies/accesses

Filemon: Lists what files the program accesses/modifies

APIMonitor: Lists what APIs the program makes calls to.

hope that clears it up