Web Services and Web References

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I am very new to web services and I am creating a thin-client windows app
that will access it's data via web services whether on a remote web site of
on an intranet server. What are the best practices for creating web services
like this? I will create my own objects and pass them through the web
services(s). Should I use 1 web service with many functions or many web
services with few functions? If I use many web services do I have to add a
web reference in my project to all of them or just one?
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