[PHP] session question

[Matt Palermo]

When a session is started on my server, it gets a name in the
"sessiondata" folder like:
 
sess_8sjg4893m9d0j43847dk4o5l2
 
 
I was just wondering if all sessions on ANY server start with "sess_"?
Is this a PHP-wide default, or can it be changed (not that I want to
change it, I just want to know if it can be changed)?
 
Thanks,
 
Matt