"get session" will show you all the sessions the netscreen is currently handling. For more or less detail, you have the following options:
dst-ip destination ip address dst-mac destination mac address dst-port destination port number or range id show sessions with id ike-nat show ike-nat ALG info policy-id policy id protocol protocol number or range rm show sessions for resource management service show sessions with service type src-ip source ip address src-mac source mac address src-port source port number or range tunnel show tunnel sessions vsd-id get vsd-id specified sessions
So you can look at a specific session, or all sessions on a given port, or any number of other ways to drill down to the info you actually want.
Not listed in that set of options, however, is "info". "get session info" will give you the summary of session info that is the first two lines of the full 'get session' output. Useful if you just want to get an overview rather than the full firehose of sessions.