Engage is a module that acts as a "floating shelf" or "gadget container". Default parts of it are iBar and Tasks, you can also add some other gadgets.
In a standard shelf or as desktop gadget or in Engage you can access the ibar settings by right clicking on an icon in the ibar.
The iBar instance in Engage is more configurable ( e.g. zooming) compared to the default because Engage has more fancy options.
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