Will Linking Several Websites To Each Other Give Me Better Search Engine Optimization Results?

My business has 4 separate websites. If I linked all of these sites together would I get better SEO results? If I linked every page on every site to every page on the other sites, would this help also? Any tips would be appreciated! Thanks!
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Moste Effective Linking Strategy For Traffic?

Hi.
Does anyone have any experience with linking for traffic purposes? (not SEO, though that’s a nice extra).
I’m not too concerned with the SEO benefits…I’m interested in what types of links have brought you the most traffic directly from the links themselves. I’m trying to optomize my time spent here….
Thanks in advance!