Since the 0.54 Beta 2, it is possible to render the same layer more than once in the cockpit configuration. The Server will take care of the multi-rendering, and also of the correct updates for all renderers. For example, it is possible to define a cockpit where the same Layer is present on two different displays at the same time.
Since 0.54 Beta 5, a new concept of "layerTypes" has been added to the cockpit configuration. With this new concept, it is possible to define one Layer, but specify different appliIDs for specific displays, allowing to define the Layer once, but managing different Layers in the cockpit, contrary to the simple multi-rendering.
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