[TYPO3] Is template switching on the fly possible?

[ronald_lists at elmit.com]

I wonder, if and how it is possible to show one and the same site with
different templates, so that we can easy compare them.

My first idea was just to install 15 times typo3, but when I think that
this could lead at the end to 100, I am not so excited anymore.

Any ideas, pointers or suggestions?

bye

Ronald