I was looking at recent vistors on one of my domains and something caught my eye. The page visited went along the lines www.mydomain.com/?o76ghfrt I know that /?o76ghfrt doesn't exist, so I followed it and it took me to the home page. So I tried browsing the site using any random digits after a '?', and everytime, it took me to the home page. Whoever was trying /?o76ghfrt .......... what was he up to ? So I goolged to see what the significance of starting a url with '?' and couldn't find anything. Are there any known vulnerablities ??