Solaris pargs gives you environment and arguments information for any given process id. If you pass just a process id (pid) to pargs, it gives you all argument variables of the running process. If you need to have arguments as a single line for using it with for example on shell use -l argument with it. Also pargs can give you environment information of any running process if you run it with -e parameter.
Sometimes this utility can be handy if you cannot see the parameters or environment variables of a process with other methods like ps or any other well known utilities.