Q1) Sitemap /SEO Plugin use Domain Mapping, Q2) Only Google?

Questions about Sitemaps and SEO - Wordpress MU Style

1) If you are using domain mapping, does it use that or the subdomain of the blog (ie mysubdomain.wpmudomain.com)to submit SiteMap.XML?

2) Does it submit ONLY to Google or does it also do MSN, Yahoo, any others?