This TruthValue indicates whether this LECS instance is the operative master currently answering configuration requests, or a redundant slave standing by in case the master fails. An admin cares because in a redundant ATM LES/LECS deployment, only the master's ELAN mappings and config tables are actually in effect network-wide, so checking this on a specific box tells you whether changes made there will take effect immediately or only after a failover. For example, after a failover event, the box that used to be a slave will flip this object to true while the formerly active LECS flips to false.