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2. If yes, When same include files on many pages will cause duplicate content issue? And mixing a couple of include files together will solve the same problem?
3. Does include files really save download time or it is downloaded each time?
4. If not read by google will include files increase the keyword relevancy since my include file contains the navigation buttons?
5. What is the preference of include file over iframes?
All your include files are appended together on the web server - to create the final HTML page you wish to create - and it is this HTML page which is "downloaded" from the server to the requesting agent.....
So your include file will never be downloaded from the server once, let alone multiple times.....unless you have done something bizarre, like put in a <a href="...."> link to it from the HTML or something...
Surfer is right. It's not downloaded as a CSS file would be. As it's called each time someone loads a page in the browser that doesn't save you bandwidth or speed up download times.
As others here have said do a View Source.
If you used the same include page in 500 different pages Google would see that as duplicate content BUT if those 500 pages all had substantial other content themselves I can't see you getting penalised.
the include file never leaves the server
That's a bit of an assumption really. If it's under the document root, it can get served if someone can guess at the URI. Forbidding it for real requires access control, and I doubt most people do that (although it's real easy with apache).
It's not 100% relevant to the original question, but I'd prefer to word that as "the included file [b]usually doesn't leave the server." I've seen googlebot spider files that have no inbound links (files such as an include file) if you view them in a browser that's toolbar-enabled. That happened to me today, which is why I'm nitpicking about the use of the word "never" in this context.
1. Does google read included files also or just the parent file?
For the other questions,
2) there shouldn't be a dupliate content issue, but I suppose you could create one if you were determined enough
3) the time savings is in maintenance of your site, included files wil take incrementally longer to serve than inline text
4) depends what's in your include files--they're inherently relevancy neutral
5) since server inclusion doesn't require anything from the client whatsoever, it wins by most criteria.
I going to create affiliate product pages thought of including description for my digital products but worried of dupilicate content.
These pages will be on my servers and can be accessed trough affiliate's design interface. so my options are iframe or include files. And i am also planning to have a copyright information which will link to my site inorder to get pr (probably iframe is out here since google wont read the content inside iframe).
Now i guess includes files are simply part of the same parent file and it adds value only interms of maintanance.
please also suggest me if there is any other way to do it.