How to setup WAMP to work over the internet?

There is a WAMP server (Win 7 pro 32bits) which needs to be accessed over the internet. Access to WAMP from another computer in the local network is ok. Access to Remote Desktop throught the internet also works. But access to WAMP over the internet does not work. Would like to receive some instruction on how to proceed in order to enable access this web server from the internet. Thanks in...