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What does the Floating Nodes Check in the Global Settings dialog box do?
A floating node is a node to which there is only one part connected. Many SPICE simulators will not run if there are any floating nodes present. The presumption is that there is no point in having only one part connected to the node, so it must be a circuit error. Micro-Cap can simulate circuits containing floating nodes without any problem, so this option is used as a likely error checker.