I have the Font. But how to call in program i have no idea. Which Keyword button to call and how to call.
The solutions you'll find fall into two categories: one to enter some number in a specific way. Similar to what Thaddy had mentioned, or like WordPad (ATL+X after the unicode number: 20B9).
The other set of solutions replaces one key or a hot key with the rupee sign. Like using a keyboard hook in your app, installing "English (India)", or some other tool to extend your keyboard.