This is a randomly generated string, provided by the broker and saved by the client on first connection if the client doesn't already have one. Previous versions of wswc used to always populate it with the mac address instead (unlike other clients) This changed in recent 5.x releases of Horizon View and behaviour is now consistent across all client types. The primary purpose is to ensure that when the "allow multiple sessions per user" option is selected for a pool, different clients are always allocated different sessions.
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