Netscreen Basics

Here is the link:
http://www.juniper.net/techpubs/software/erx/junose61/swconfig-system-basics/frameset.htm

This is everything you wanted to know about managing netscreen firewalls. Sadly it's in PDFs which make it a hassle, but this/these are the guides you want:

• CLI guide
• Writing CLI Macros
  
• HA guide
• Packet Mirroring
• Logging System Events (Includes event descriptions)

You can either open/download the individual PDFs or download the entire guide as one large PDF:
http://www.juniper.net/techpubs/software/erx/junose61/bookpdfs/swconfig-system-basics.pdf