This read-create INTEGER is the fourth tuple-pointer slot in an ACE, one of up to eight, letting the admin stack yet another independent match condition onto the same rule. An admin uses additional slots like this one when a single ACE needs to combine four or more distinct fields, such as address, port, protocol, and a DSCP value, before the configured action applies. For example, an admin building a rule that must match a specific source subnet, destination port, protocol, and DSCP marking together would use this fourth slot to reference the Tuple holding that DSCP match value.