The main function of this dialog is to set up a directory structure for running the Unravel program when the user first runs it from Web Start. The base directory is defined here to mean the top-level parent directory for the application's work area on the user's disk. The base directory name is UrvbaseJ and renaming it by the user is not supported. Further details on the base directory are provided elsewhere.
The Base Directory Chooser dialog can also be used to create directories when the program is first run from urvall.jar in non-Web Start mode, but all the required jar files (urvall.jar, jh.jar and jnlp.jar) need to be transferred to the UrvbaseJ directory for future running of the program from urvall.jar.