Maps on web sites

Hey,
Does anyone know how some business web sites have their location displayed in a map from MapQuest.com??
Is it a web service that they're using??I mean, when it's embedded in their sire. I know how to do it to open the Mapquest site with the map.

I want it to be inside a control on my site.

Thanks,
Goto MapQuest/MapBlast... there should be alink on there telling you how to "get this map on your site"...