Reading from two NAV DB

Hi,

I need to read data from company x which is situated in server and DB x by using a codeunit in company y situated in a different server and db. What's your suggestion to go about it? I was thinking of using webservices but cannot find the how to call a webservice from NAV. I know how to publish - very easy - but not how to read.

Can you please help me out?

Thanks,