Invoke this method to get your Sid. Sid is an internal user identifier Upsight uses. In situations, you may want to use this identifier for your own internal purposes or store it on your servers.
A method that gets information about the current Upsight session by returning an
USSessionInfo object. If no session is active, this method will return the most recent session information. If no session has been recorded, then a default
USSessionInfo object with sessionNumber of
0 will be returned.