$SESS class variables reset after each page render?

Hello,

I am building a plugin which attempts to set a custom $SESS class variable which needs to be stored and reused within multiple template groups in the EE site. My question is: Is a $SESS->cache variable reset after each page renders?

What I want to do is check if the $SESS variable is already set, and if not, set it for reuse.

if (!isset($SESS->cache['custom']['variable']))
{
    $SESS->cache['custom']['variable'] = $IN->GBL('ID');

} else {
    
    $SESS->cache['custom']['variable'] = "value";
    
}

This code works, but it doesn’t seem to retain the $SESS variable. Is a COOKIE a better approach in a case like this?

Cheers

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