Hi Mike

The script which shows what variant to display is based upon the size of the browser that you are viewing your website on. Whereas you can drag a desktop browser to a smaller or larger window to change variants, you can't do this with mobile devices. All variants of a page are combined one file, hence why you can't link it either.

I can understand the want for a view desktop version button. I myself have found some sites just to be plain nicer on the desktop than mobile to view and read.