ker/cls/WTag.js
function(signal, arg) {
            var slot = this._slots[signal];
            if (slot) {
                slot.call(this, arg, signal);
                return true;
            }
            return false;
        }
function(signal, arg) {
            var slot = this._slots[signal];
            if (slot) {
                slot.call(this, arg, signal);
                return true;
            }
            return false;
        }
function ( signal , arg ) { var slot = this . _slots [ signal ] ; if ( slot ) { slot . call ( this , arg , signal ) ; return true ; } return false ; }
Call the slot mapped to the "signal".
@param signal : name of the signal on which this object may be registred.
@param arg : argument to pass to the registred slot.
@memberof WTag
Call the slot mapped to the signal .