Question about mass link indexers – how do they work?

Hello everybody,

A side issue to indexers – I've always wondered how they work. I'm not talking about indexers sending your link directly to Google with a proxy. I wonder more about the mass indexers like EliteIndexer and ExpressIndexer (these are the only two I know).

Does anyone know how they work? Do you build crap T2 links or do you actually have a different type of indexing? These are mass indexing services. I assume it's something pretty spam.

Does somebody know?

P.S .: Also secondary question, do you think they really work? I have never really used it, but I think about it.

Many Thanks