what's repremand php.ini's session.save_path?

i'm controlling php windows/iis.

my event variables don't seem recorded page-to-page.

this code…

//echos out event variables good format inspection
echo "<p><pre>";
print_r($_session);
echo "</pre></p>";

…outputs vacant values, this…

    array  
    (  
        [s_firstvar] =>  
        [s_var2] =>  
        [s_third] =>  
        [s_numberfour] =>  
        [s_youget] =>  
        [s_thepoint] =>  
        [] =>  
    )

i found suggestions forum…

i identical problem recently (win2000, iis), incited out php
have write-access whatever office event information was
stored in. competence wish feeling this.

and

have set session.save_path?

what's repremand php.ini's session.save_path? and, problem?