Glabal variables

I need to use session variables in my php application and so define then using <?php session_start(); session_register("user"); but for this I need to set the register_global to On. In my ini file i see the following comment: ; You should do your best to write your scripts so that they do not require ; register_globals to be on; Using form variables as globals can easily lead ; to possible security problems, if the code is not very well thought of. register_globals = Off What other way can i use session variables in my application. Please help, Thanks