Isolated, Initial, Medial and Final?

I am working on a font using FC 5, which, like arabic, and many other eastern scripts, requires the characters to have isolated, initial, medial and final positions.

EXAMPLE: Here is an example character, with the four shapes being in the order as mentioned above:

How would I make Font Creator recognize whether the character was in the start, middle or the end of a word, or not in a word at all?

Create your font and than add open type features by using Microsoft free utility VOLT. Please search VOLT in this forum.

Shahu