This is a keyboard (layout) that you can install in Windows 7, 8, 8.1 and 10. The layout is closer to the classic Bamini keyboard layout for Tamil typing. To install: Execute setup.exe and follow instructions. To use/ enable: Go to control panel -> Language -> Click on 'Add a Language' to add Tamil (Sri Lanka) -> Once language is added, click on 'options' for this language -> Click on 'Add an input method' and follow instructions -> Once the keyboard 'Tamil - Bamini keyboard' is installed, you should find it available in the list of keyboards shown in system tray or in the windows language toolbar. (Follow common Windows help material/ instructions found online to get the toolbar activated if not available by default).
This keyboard, usually known as the Bamini layout, is designed for the Tamil language. It is originally based on a Tamil typewriter keyboard, and is used.