Adds the specified network service to the specified set.
- macOS 10.4+
The set (the complete configuration for a single location).
The service to add to the set.
TRUE if the service was added to the set;
FALSE if the service was already present or an error occurred.
Prior to OS X v10.5, the Network Preferences pane did not support having a single service being a member of more than one set. Therefore, an error is returned if you attempt to add a service to more than one set on a pre-10.5 system.