Which web service and which property or method would I use to access the site collection administrators for a site? Also, is it possible through a webservice to enumerate all of the site collections and get the administrators from each one?
I don’t have a proper development environment so I need to do this through the web services. Thank you.
I’m not sure that this functionality exists natively. You should be able to create your own service hosted in SharePoint though and create the functionality you are looking for.