SESSION vs ENV variables?

Hi, My script needs to load a config file with DB connection properties, etc. At the beginning of the session, the ini file is loaded and all values are stored in $_SESSION After the loading, a flag is also set in $_SESSION so that the ini loading is no more executed. However, all ini properties are the same for all users, so I wonder if I could put them in a cross-session variable. I guess $_ENV or $_SERVER should be good. So, the question could be : If I put something in $_SERVER, will these values be available for ALL users? Any idea? I have to keep the ini file, and could not hard code those properties. Vincent