Sets the value of the preference named <pref-name> to the value of <pref-value> on the current network.  If <pref-value> is not provided, the current value of <pref-name> will be displayed.  If both <pref-name> and <pref-value> are omitted, all preferences will be displayed.  If <pref-value> is a minus ('-') character, then the preference will revert back to its default value.
Sets the value of the preference named <pref-name> to the value of <pref-value> on the current network.  If <pref-value> is not provided, the current value of <pref-name> will be displayed.  If both <pref-name> and <pref-value> are omitted, all preferences will be displayed.  If <pref-value> is a minus ('-') character, then the preference will revert back to its default value.