Is there a way to get fields from websites that is installed in another domains? The background: I want users from other websites enter details of their hotel and show them all on a “mother” website where i have an overview of all these hotels.
This would be possible with a multisite install, you can then do switch_to_blog()
and then query the posts on individual sites. http://codex.wordpress.org/Function_Reference/switch_to_blog
Outside of a multisite install I don’t think this would be possible.