New answers tagged arcgis-9.3
You can watch this link. Network Analyst options will be activated after following certain steps on setting up the problem. http://video.arcgis.com/watch/2109/creating-network-datasets-cost-attributes-and-evaluators
I cannot imagine this being an out-of-box option within the application. In 10.2, you may assign shortcut to turn on/off all layers in the TOC, but not specific to certain layer names. Most likely you will have to develop either VBA or .net function using arcobjects that calls a command on keyboard shortcut (to turn x layer on or off). Assign Shortcut Key ...
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