1. A method for facilitating tracking of packets through a plurality of localized transaction-tagging domains, comprising: determining a local tag applied by a device under test of a first localized transaction-tagging domain to an output packet of the device test, wherein the output packet is generated by the device under test using at least a portion of information carried within an input packet thereof wherein a local tag of the input packet is different than the local tag of the output packet, wherein the input packet has a system-generated global transaction tag associated therewith and wherein the output packet includes information relating to a transaction associated with a device under test simulation that is carried out across the plurality of tagging domains; and applying the system-generated global transaction tag associated with the input packet to the output packet in response to correlating the local tag of the output packet with the local tag of input packet, wherein the global transaction tag is a unique identifier that identifies all packets associated with the transaction globally across the plurality of localized transaction-tagging domains whereby said global transaction tag enables unification of a plurality of disparate packets associated with the device under test simulation.