Gateway Pages for Search Engines

I've been reading  on different sites about "Gateway pages " to help
promote, and get higher listing for the top search engines.

One frequently mentioned fact is that the different search engines look for
different things

My question is...
     If i devise an appropriate Gateway page..as they call them (splash
page, entry page ), to satisfy each search engine, but the domain name is
the same for each search engine, how do i do that? make the site with one
gateway page...submit to one engine and wait? (how long??) before changing
to next Gateway tailored for next search engine....and repeat...  ???

Any hints or comments on this?

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