Intranet to Internet

[Archna]

Dear Friends

I am new to web development. We have made a web
application which is currently running on intranet.Now we
want to run this application on internet.
One more interesting thing about our application is that
we also have windows interface also . Both the windows
applications and the Web client use the same database.

What are the things required to do to switch my
application to internet.

Please give me idea regarding that.

Thanks in advance
Archna