How to make your apache application accessible within network

I have a Windows XP machine where I have installed WAMP and made a PHP based web application. I can access the web application from within this machine by using the browser and pointing to: http://localhost/myApp/ --- and the page loads fine.

Now I want this site (http://localhost/myApp) to be accessible to all machines within the network (and may be later, to the general public as well). I am quite new to this, how do I make my site accessible to all machines within the network and to the general public in the internet?

I tried modifying the httpd.conf file in Apache (WAMP) by changing
Listen 80 to Listen 10.10.10.10:80 (where I replaced 10.10.10.10 with the actual IP of this windows xp machine). I also tried "Put Online" feature in WAMP. None seem to work though.

How do I make it accessible?