significance of pfiles

What is the significance of pfiles?
What is the use of it and how and where to use it?:wall:

pfiles [pid] shows the files a process has open; it is like fuser and lsof. You can use it on processes you own, or all processes if you are root.

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Thanks Jim,
Will like to know one thing more, how can i use pfiles for knowing if a process is hung?
and also can i take that process from hung state to active state by using pfiles?