UNIX for Dummies Questions & Answers

Hello every body.
Do anyone describe to me functionalities of PFILES

pfiles Report fstat and fcntl information for all open files in each process. It also combines or consists of proc : pflags, pcred, pmap, pldd, psig, pstack, pfiles, pwdx, pstop, prun, pwait, ptree & ptime

Usage:
/usr/proc/bin/pfiles [ -F ] pid ...

These proc tools stop their target processes while inspecting them and reporting the results: pfiles
*(Note) A process can do nothing while it is stopped

I have a list of PID stocked in an external file.
What is the command that let me use all the PIDs on the file as PFILES arguments ?