How to use web services in JSF app

I am unsure if this is the right forum for this question. Let me know if it is not - and where I should go.
Anyways, I'm building a JSF web app, in which there is a datatable page displaying some business data. The app is going to be deployed and run in the customer's web server, but the data to be displayed is from the business solution provider's database. Currently the provider supplies web services to retrieve the data. So, my task is to call these web services from my JSF page, get and display the data.
I've never used web services before. Can someone give me a quick start, as what I need to know to use these web services, and how to use them in coding terms. I googled the web quite a bit and finally decided to turn to SDN forum.
Thanks!

http://help.sap.com/saphelp_nw04/helpdata/en/9b/dad1ae3908ee44a5caf57e10918be9/content.htm
http://help.sap.com/saphelp_47x200/helpdata/en/2d/64d029e74911d6b2e400508b6b8a93/content.htm

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