Originally Posted by evo
So long as it isn't linked to from anywhere, mainly the current website, and you make sure that your robots.txt file is set to not index, nor follow, you should be ok.
Alternatively, you can use a subdomain, e.g. dev.domain.com.
Also, try use a separate database too.
How do I create that subdomain? Also, is it relatively easy to install a different usable version of WP in this dev environment.