An attribute whose value applies to all systems is global in scope. An attribute whose value applies on a per-system basis is local in scope. The at operator (@) indicates the system to which a local value applies.
An example of local attributes can be found in the following resource type where IP addresses and routing options are assigned per machine.
MultiNICA mnic ( Device@sys1 = { eth0 = "166.98.16.103", eth1 = "166.98.16.103" } Device@sys2 = { eth0 = "166.98.16.104", eth2 = "166.98.16.104" } NetMask = "255.255.255.0" RouteOptions@sys1 = "-net 192.100.201.0 192.100.13.7" RouteOptions@sys2 = "-net 192.100.201.1 192.100.13.8" )