It is not recommended to edit those properties directly in the registry. When you install NAS, it also installs a MMC snap-in for setting them up. You should see a selection called "Microsoft Business Solutions-Navision Application Manager". If you don't see that, you can just go to Run and type in MMC and add the NAS snap-in to the console.
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NAS storing its settings in the registry HKLM\System\ControlSet001\Services\<nas service name>.
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