There are two main categories of variables that you can use to manipulate the look and behaviour of your switchboard applet:

Look
var language	This variable changes the language of the applet.   Valid values are en, fr, de, se, or pl.
var default_color	Default color on the applet.
var light_color	Light color on the applet.
var medium_color	Medium color on the applet.
var dark_color	Dark color on the applet.
Startup Behaviour
var auto_startupControls the startup mode of the applet.  Possible values are: "login", "register", or "blank".  If the mode is "login", then the applet will use the other startup variables to attempt to log the user in.  If the mode is "register", then the applet will attempt to register the user, and if the user is allready registered, it will log the user in.  If "blank", or any other value is used then the default login or register applet screen will be displayed at startup.
var usernameThis username value will be used when attempting an automatic login or register.
var passwordThis password value will be used when attempting an automatic login or register.
var emailThis email value is used to notify the user of "add contact", "vmail", and "registration" events.  The user will be sent an email telling them to go to the notification URL, that you specified when you created your site.  This email value will be used during automatic registration.
var firstnameThis firstname value will be used when attempting an automatic login or registration.
var lastnameThis lastname value will be used when attempting an automatic registration.
var cityThis city value will be used when attempting an automatic registration.
var countryThis country value will be used when attempting an automatic registration.