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Info_nodes are essential for monsters who need to move under AI control. The engine draws a 'node graph' based on the positions of info_nodes in a map, and monsters can then find the quickest route from point A to point B via the nodes.
Notes
To check your info_node placement, compile the map and run it. From the console type 'impulse 197' and you should now see a glowing path of node tracks. This will show up any weak points in your placement and areas that may need more nodes.