Mapserver Itasca Application is a thin-client. We can use zoom in, zoom out, pan, query a feature. Image map shown have been done in server. Client computer display map only. Thus, sometimes it response slowly. Moreover, it is created by HTML.
Openlayers is a medium-client. We can use zoom in, zoom out, pan and get information by popup. Although Internet disable that we can see popup information because in this section is rendered in client computer. Mapserver Itasca Application cannot be able.
Report the discussion in part 1 and 3