alternative URL website & search engine crawlers

[Wupsje]

Hi,

What would be the best/easiest method to make sure search engine crawlers don't index/find a website on the alternative (staging) URL?

We've got a few websites that somehow google found on the alternative URL. We would like to make sure this doesn't happen again.

Regards,

Wouter

[ephigenie]

make proper use of a robots.txt ...