第一次访问wordpress的介绍页面，与htaccess

I am trying to do an introduction page for a website. The trick is, i would only like the user to be redirected here on the first visit. E.g. if he has no session yet. (Although I am not familiar what else to use.) I have been told about .htaccess could do the trick. I use the wordpress engine.I am trying to do an introduction page for a we