I dont think so Dave, they would need to log on as you with your username and password to be able to do it.
If its webspace provided by your ISP they may even have to be on the same ISP to be able to do it as well as some ISPs only allow access from their own dial up
The other way would be to set up a server and the you can give your friends acces to it , on your pc with a sperate log in username/password for each user.
Theres a free program available here :
www.dynu.com which also has an IP tracker thats a freebie as well, if you are on a dynamic IP.
XP has its own built in server software too