How to share a contact list using Data View Web Part in Sharepoint 2010

Hello,
I am fairly new to SharePoint and trying to create a centralised contact list that can be shared or made visible in all site collections in my company...I had some suggestions to use data view web part however it is not very clear to me how to get this working..

In short what I am trying to achieve is:
1. Create a contact list
2. Share it between all site collections in my organisation

If anyone done this before could you suggest what steps I need to take? Maybe there is an online guide I can follow? Or do you know any other ways of getting this to work?

Any help and suggestions would be greatly appreciated.
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Nolan GustavoAsked:
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zephyr_hex (Megan)DeveloperCommented:
there already is a built-in contact list, of sorts.  it's the list of sharepoint users.  and that list is per site collection.

if for some reason you want to create a new contact list...
my suggestion is to create one for each site collection.

then, use Data View Web Part to link each of the lists so you have one complete list.  and display the DVWP on each site collection.

this article discusses the basics of the DVWP
it also explains how to link more than one list into one view (Working with Related/Linked Data Sources)
and how to connect to each site collection list (Connecting to another library)
http://www.lcbridge.nl/vision/2009/dvwp.htm
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