No not by default.
But if you set your router to Port Forward port 80 to your wamp PC
and
Allow port 80 through your PC firewall if you have one
and
Put wamp ONLINE
Then they can see your site using your ipaddress like [
111.222.333.444]
If you then get yourself a dynamic domain address from someone like dyndns then yes they can see the site as the domain address you pick from the limited possible address's available from dyndns.
it will be something like yourselectedname.dyndns.org but its better than having to remember an ip address.
look at dyn.com I think they let you have up to 2 free dynamic domain address's