The customization of the LUCAS interface is consistent with other X Windows
applications. In particular, a resource file (LUCAS.rf) is used to
notify the X Windows window manager of default values for particular
resources (e.g., font). For simplicity, the notification of these values
to
the window manager is provided through the local XENVIRONMENT
environment variable. Before invoking the LUCAS interface, the user
executes XENVIRONMENT=LUCAS.rf at the system prompt to notify the
window manager of the user-defined resources (see Appendix 
for this
example resource file).