apc_store and apc_fetch between apache processes

Is APC cache memory shared by all apache httpd child processes or does each httpd process have its own APC cache memory? If I call apc_add('foo','bar') from httpd child 1 And later call apc_fetch('foo') from httpd child 2 (a different linux process) will the apc_fetch return 'bar' ? Sorry to post this here (probably not the appropriate venue). My comp.lang.php newsgroup posting went unanswered, and I could not find any APC documentation which would answer this question. Andrew