Force theme

[imps]

Hi, I would like to know if anybody here has figured out how to force the use of a specific theme from the URL. Something like a theme switcher would do.

 

http://myshop.shop -> normal theme

http://myshop.shop/t...p?=myothertheme

 

I would like to do something like this without a plugin-

Edited October 6, 2012 by imps (see edit history)

[Dreamtheme]

I don't think you can. Theme name is initialized by php.