Origin of Urdu Script

Some people of the opinion that the only difference between Urdu and Hindi is its script, Urdu uses Persian-Arabic script and Hindi uses sanskrit script called Devnagri. There are other differences too, but the grammar is common between the two languages. It is interesting to note that many languages share Arabic script of writing. Follow the link to see many scripts and how letters are used in different languages, also some letters are unique to certain language added to capture sounds that is found only in that language.

http://www.geocities.com/sikmirza/arabic/arabic.html