The NetBeans userdir is the directory where NetBeans stores user configuration data such as window layouts, editor settings, menu and toolbar customizations and various module settings.
Per default, the userdir is a (hidden) directory called .netbeans stored in the user's home directory. The home directory is ${HOME} on Unix-like systems, and %USERPROFILE% (usually set to C:\Documents and Settings\<username>) on Windows. As the name suggests, the userdir is unique per user. For each version of NetBeans installed, the userdir contains a unique subdirectory .netbeans/<nb-version>.
To find out your exact userdir location, go to the IDE's main menu, and choose Help > About NetBeans. (Mac: NetBeans > About NetBeans).
Applies to: NetBeans 3.6, 4.0, 4.1, 5.0, 5.5, 5.5.1, 6.0, 6.1, 6.5
Platforms: All