ServiceRegistrar

[Peter Firmstone]

For a ServiceRegistrar implementation where you don't want to register 
Services (A static ServiceRegistrar used only for lookup) would 
returning a null ServiceRegistration suffice?  Or is this fraught with 
danger, has anyone ever tried it?

Use case:  You've got an internet facing Registrar and you don't want 
external Services to register.

Cheers,

Peter.