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The "L" command will move you back to the last node you visited, even if it is in another file. All commands which change nodes, except this command, cause the node name to be saved for use by this one. The number of nodes saved should ideally be unlimited, but FORTRAN static storage requirements regrettably put a cap on things, and currently only the last ten nodes are remembered. They are stored in a ring buffer, so when it fills up, successive "L" commands will just cycle around the ring, visiting the ten remembered nodes.