Link from an orphan page is useful or not?

No
Because the page is not linked to any website page and you cannot visit it through any referral link and these pages are mainly
for more details
http://www.searchenginejournal.com/…
orphan pages link is never useful as they are not connected to site so the chance of getting crawled is less and if you are finding the page cached or page with rank than it might get cached or ranked when it was connected to website. orphan pages are mainly use for link building purpose and i think it comes under Black Hat technique but i am not sure about it.
Ok. That is sooo nice of you all. But now tell me if there is a page "www.xyz.com/abc"; which is not connected with any page of the domain "www.xyz.com";. Now if that "www.xyz.com/abc"; page gets a link from a very reputated site (may be more than 1link). Then will it help in any way www.xyz.com??
still i will not take link from that page, coz if that page is associated with any other page that means we are building link for that page only but still it is an orphan page/ dead page. that page may get ranked after building backlinks for that but still how to reach at that dead/orphan page??
no it's not at all good to tk link frm orphan page, if we tk link frm orphan page then it shows an artificial link building which not at all good in Google eyes
We have some orphan pages ranking well as these orphan are linked from some of the forum pages of the website + external links. If the domain is good, do get the link and also add few links to the internal orphan page so that Google can cache it. In this way the link will become really useful. As mentioned always ask 1) Who is linking to me (The value of domain) 2) In what context are the linking to me (Page & Link position) ... if the Who part is strong go for it. This also helps in trust ranking.

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