See [http://amahi.blip.tv/file/1491674/| the screencast on how to use webapps].
'''NOTE:''' the screencast is slightly outdated - the webapps are no longer in their own tab - they are under Applications -> Webapps(Amahi 6), and Advanced settings must be enabled for them to show. The Amahi [https://www.amahi.org/apps/web-apps Web Apps] application provides this functionality for Amahi 7.
Creating a webapp creates a root directory (gives you the choice to change it) and a short, local dns name to conveniently access that app.