The document discusses exception handling in the Zend VM. It provides code examples of throwing, catching, and rethrowing exceptions. Key points include: - Exceptions are thrown using THROW and the VM will search the EXCEPTION TABLE for a matching CATCH block. - If no match is found, the exception is rethrown until it reaches the outermost catch block or causes a fatal error. - Finally blocks are executed after catch blocks and any exceptions thrown in finally will override the original.