@NogDogAug 02.2006 — #I suspect the first limit you would hit is the overall memory limit, which will be the lesser of the "memory_limit" PHP constant or any other memory limits imposed by your web host. This would be the limit for all memory used by your script, including the $_SESSION array. The default value for "memory_limit" is 8MB, but is modifiable via php.ini, .htaccess, and/or ini_set().