This read-only DateAndTime value reports the last date the client's software information was refreshed, defaulting to January 1, 1970 if unknown. An administrator uses it to judge how current the software inventory data for this client is before relying on it, for instance when auditing installed patch levels. For example, a client whose clntLastSwRefresh is months old compared to its peers would prompt the administrator to trigger a fresh software inventory scan on that machine.