As root you can use sysctl to view the system wide fs.file-max parameter. You can also change it as root.
For the session values... you can use ulimit -H -a to see the current hard upper limit (root can set the hard limit) and ulimit -S -a to show the soft limit for current session process.
Many people are interested in settting the session values for everything.. that is what is described in the example in the man page for initscript (shows the core file setting being changed.... using initscript effectively changes the value system wide.. you will have to reboot though.. or at least reload the runlevel).
Here's a website with more info (some examples):
http://www.cs.wisc.edu/condor/condor...alability.html