Layout files also contain the netlist that describes how the elements
are supposed to be interconnected. This list of connections can be
loaded from a netlist file (see Netlist File), or
entered by drawing rat-lines as described
previously. Each net has a name and routing style associated with it.
The net contains a list of all element layout-name names and
pin numbers that should
be connected to the net. Loading a netlist file will replace all
existing nets with the ones from the file.
The Netlist window provides an easy way to
browse through the net list. You can display the rat's-nest by selecting
optimize rats-nest
from the Connects menu. If you move or rotate elements,
the rat's-nest will automatically follow the movements, but they won't
necessarily show the shortest paths until you optimize them again.