NSM receives logs from all the devices and the logs are stored under /usr/netscreen/DevSvr/var/logs folder on NSM Device server.These logs are saved in binary format and cannot be viewed directly. A small article about exporting in csv, to be viewable.
MultiTail lets you view one or multiple files like the original tail program. The difference is that it creates multiple windows on your console (with ncurses). The article contains installation info and screenshots of the program running.