Java ES installer silent installation is a non-interactive mode that allows you to install Java ES components on multiple host servers that have similar configurations. You first run the installer to generate a state file (without actually installing any components) and then edit a copy of the state file for each host server where you plan to install Access Manager and other components.
To select Access Manager in Legacy (6.x) mode, set the following parameter (along with other parameters) in the state file before you run the installer in silent mode:
... AM_REALM = disabled ...
For more information about running the Java ES installer in silent mode using a state file, see the Chapter 5, Installing in Silent Mode, in Sun Java Enterprise System 5 Installation Guide for UNIX.