Yep- take a look at core.system.php- action requests branch off before calling the template class. Basically.
// ----------------------------------------------
// Process the request
// ----------------------------------------------
switch (REQ)
{
/** ---------------------------
/** Action Requests
/** ---------------------------*/
case 'ACTION' :
require PATH_CORE.'core.actions'.EXT;
$ACT = new Action();
break;
/** ---------------------------
/** Page Requests
/** ---------------------------*/
case 'PAGE' :
etc... including template class
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