Any programs to monitor bandwidth usage?

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http://serverfault.com – I'ved look on google for something and I apologize for posting this but I haven't found anything that suites my needs... I need a program that can monitor a specific computer's bandwidth, how much bandwidth that program is using, and (as a bonus, don't really need this) the port number the application is using. I need it to be able to monitor one computer and provide lots of detail on that one computer, most of the stuff I've come across is for monitoring a network. Sorry if this question doesn't fit your Q/A guidelines... (HowTos)