-h, --help: Print descriptions of common startup parameters.

--jdkhome jdk_home_dir: Use the specified version of the JDK instead of the default JDK.

--cp:p classpath: Prepend the specified classpath to the IDE's classpath. This option is generally not recommended for any purpose.

--cp:a classpath: Append the specified classpath to the IDE's classpath.

-Jjvm_flag: Pass the specified flag directly to the JVM, for example -J-Xmx512m

--laf ui_class_name: Use a given class as the IDE's look and feel.

--fontsize size: Use a given size in points as the basic font size for the IDE user interface.

--locale language[:country[:variant]] : Use the specified locale.

--userdir userdir: Explicitly specify the userdir, which is the location in which user settings are stored.

--open file, --open file:line: Opens the file in the IDE's source editor at the specified line.

[http://wiki.netbeans.org/FaqStartupParameters]