public HTTPSession setUseSessions(boolean tf)
    {
        localsettings.put(Prop.USESESSIONS, (Boolean) tf);
        this.cachevalid = false;
        return this;
    }
public HTTPSession setUseSessions ( boolean tf ) { localsettings . put ( Prop . USESESSIONS , ( Boolean ) tf ) ; this . cachevalid = false ; return this ; }
Should we use sessionid's?

@param tf