How Arabic Letter Changes from Isolated to Initial and Medial and Final??

Salam to all members

This is my first posting but not the first visit to the forum. I have some problems to share with forum members if anyone may solve my problems. I want to write an algorihm for Arabic characters but I did not achieve the goal after trying for round about 10 hours. I will justify my problems with the help of steps (let suppose for some characters).
1. When I press a key for Arabic letter Beh (ب), its isolated form is displayed.
2. In step 2, not pressing any space, when I press another kety, say Kaf (ك), the letter Beh changes to its initial form while letter Kaf automatically changes to its final form.
3. In step 3, the step 2 is repeated untill the space button is not pressed.
HOW THIS WHOLE PROCESS IS PERFORMED, PLEASE GIVE ME YOUR KIND ATTENTION.

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