g1smd

msg:4459795 | 8:43 am on May 31, 2012 (gmt 0) |
Google chooses those at their discretion. You can't influence the initial choice. You can tell it to not choose certain pages via a setting in webmastertools.
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lucy24

msg:4459816 | 9:38 am on May 31, 2012 (gmt 0) |
By "sub-pages" do you mean fragments? There probably has to be an anchor directly attached to a heading. I don't think anyone knows what the exact cutoff is, or if there are other variables. Mine tend to be h3 on pages with no h1.
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g1smd

msg:4459817 | 9:48 am on May 31, 2012 (gmt 0) |
I took the question to be all about sitelinks rather than named anchors, but either of those is a possibility.
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Robert Charlton

msg:4460694 | 7:57 am on Jun 2, 2012 (gmt 0) |
Which is it? You can influence named anchors. "Sitelinks" are generally the most popular 4-6 pages linked to from your home page, but usually only appear when a site is dominant for a search query. Usually, a site is dominant for a search on its own domain name, so Sitelinks will appear then, but results vary greatly on how important a site is for a given query. "Named anchors" are sections of a page. Check out this early discussion of them, where the vocabulary wasn't quite precise because we hadn't seen them before, and we at first thought they were a variety of Sitelink.... Page Fragment Navigation in Mini Sitelinks - and snippet! http://www.webmasterworld.com/google/3977406.htm [webmasterworld.com]
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