google maps - OpenLayers: value of Event parameter in OpenLayers.Event.triggerEvent -

i'm looking @ documentation triggering events in openlayers. lists triggerevent taking in type:string argument , evt:event argument. understand type parameter is, object event object? can't find clear example.

if relevant, working on interface between google maps v3 , openlayers, , i'm trying come way can have same api interface calls to:

• google.maps.event.trigger(instance:object, eventname:string, var_args:*)
• openlayersobj.events.triggerevent(type:string, evt:event)

doc wrong. should event || object. object args passed listeners callback.

look @ source: https://github.com/openlayers/openlayers/blob/master/lib/openlayers/events.js#l820 example of use: https://github.com/openlayers/openlayers/blob/master/lib/openlayers/map.js#l1042