NHM Writer is a tool that provides you the ability to type in 10 Indian languages. After you install this application, an icon on your system tray will appear. After that open an application that supports NHM Writer, e.g. MS Word, Pagemaker, Indesign, etc. Then go to the icon from your system tray, right click on it and a pop-up message with Keymap will appear. Select one from there and start typing. If you want to see a video tutorial that explains how this application works, I recommend you visit Software Informer application's page.