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syscalls

To see what syscalls nw is using use:

strace -o nw-strace.log -f ./tmp/nwjs/nw .

Then look into the nw-strace.log file.

mDNS

By default, chromium opens a local listening socket at 224.0.0.251:5353 to receive device discovery notifications.

This can be disabled at the chrome://flags/#device-discovery-notifications page (search for Device Discovery Notifications) or with the chromium arg --disable-device-discovery-notifications (like its done with the chromium-args property in package.json).

NB It seems mDNS can only be fully disabled by recompiling the nwjs source; see the enable_mdns build flag at https://github.com/nwjs/chromium.src/blob/6d4b9e7239747d19eb6f26c67dc331fb43727348/net/BUILD.gn#L70.