Views and Groups are similar in that both of them are logical groups cameras based on more than just the server they are connected to. The major difference is that a View also defines a layout of the cameras onscreen. Because it specifies a layout, the maximum number of cameras in a View is limited to the maximum number of cameras that can be shown onscreen at once, whereas a Group does not have that restriction.
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What-is-the-difference-between-a-Group-and-a-View.pdf