Multiple services in one assembly. How installer knows which service to install and start?

Question

I have a project which includes 2 windows services. I create a ProjectInstaller to install these items, which works fine. But I have a question; given the code defined below, how does the project installer know which service to install for serviceInstaller1 and which for serviceInstaller2?

Is it simply based upon the ServiceName?

[RunInstaller(true)]
public partial class ProjectInstaller : System.Configuration.Install.Installer
{
    private ServiceProcessInstaller process;
    private ServiceInstaller serviceInstaller1;
    private ServiceInstaller serviceInstaller2;
    public ProjectInstaller()
    {
        InitializeComponent();
        try
        {
            process = new ServiceProcessInstaller();
            process.Account = ServiceAccount.LocalSystem;
            serviceInstaller1 = new ServiceInstaller();
            serviceInstaller1.ServiceName = "xxx";
            serviceInstaller1.Description = "Does Something";
            serviceInstaller1.StartType = ServiceStartMode.Automatic;

            serviceInstaller2 = new ServiceInstaller();
            serviceInstaller2.ServiceName = "yyy";
            serviceInstaller2.Description = "Does something else";
            serviceInstaller2.StartType = ServiceStartMode.Automatic;
            Installers.Add(process);
            Installers.Add(serviceInstaller1);
            Installers.Add(serviceInstaller2);
        }
        catch (Exception ex)
        {
            throw new Exception("Failed", ex);
        }
    }
}

Answer 1

It is based on ServiceName.

Installer doesn't really care about the name, you can supply pretty much any name and installer will be happy to register a Windows service with this name for you, but when you attempt to start service it will fail, unless it finds service in your assembly that has ServiceName matching to the ServiceName specified in the installer.

Error 1083: The executable program that this service is configured to run in does not implement the service.