Question about mass link indexers – how do they work?

Hi everybody,

A secondary question about indexing – I always wondered how they worked. I'm not talking about indexers that send your link directly to Google with a proxy, I'm asking more about mass indexers like EliteIndexer and ExpressIndexer (these are the only two I know).

So, does anyone know how they work? Do they build T2 crappy links, or do they really have another way to index? These are mass indexing services, so I guess it's something quite spammy.

Does anyone know?

P.S .: As a secondary issue, do you think that they actually work? I never really used them, but I think about them.

Thank you