The Indus Viper started on April 21,2008 and today it is April 26, yet there is no news anywhere as to what has really happened during the exercise, only speculations. It is not even clear whether the PAF's J-17s have already participated. All that is known is that F-16s of the Turkish airforce is taking part.
In year 2004, a joint US-Indian Airforce exercise was held in India, went by the name 'Cope India'. Some F-15s of USAF participated in aerial combat against IAF SU-30 MKIs. It was a pure dogfight exercise. USAF F-15s were operating under some constraints, when simulated engagements were happening. It came out that, every time IAF SU-30s were able to 'Kill' the enemy aircraft (F-15s). The outcome of the exercise was a blow to USAF invincibility and provided a great boast to IAF, as IAF employed its own tactics, to counter USAF Aircarft. Both the countries share each Airforce's experience and learn a lot from each other.
Now consider 'Indus Viper', well impressive name for onlookers.
Similar aircraft are particpating, DACT is out, dont consider pitching F-7s against F-16s, our Turkish friend may not like it.
Before that, consider this.
Our Airforce is India specific, designed and equipped to meet India's threat adequately. Our aerial strategy and doctrine revolves around " Survive and fight against heavy Odds". Our training, aerial tactics is based on this.
Turkish Airforce is part of a bigger NATO Airforces. After the cold war is over, presently, NATO is engaged in more peace enforcing missions in troubled region of Europe, Balkans, Kosovo and then in Afghanistan. Now NATO Airforces find themselves in flying and enforcing 'No Fly Zone' Missions. Hot aerial combat , 'against heavy odds', is no more their. NATO forces are more concentrating over combined arms action, close co-ordination between Army- Airforce. The biggest threat to Turkey came from Kurds, so Turkish Airforce may be more bent upon providing Close Air Support to land Forces.
The point is , there is not so much common between the two Airforces, in terms of Aerial strategy and doctrine, then what are we jointly training. Turkish Pilots are here in Pakistan, because, either, PAF pilots were there in Turkey, in near Past, or they will be visiting Turkey, in near future, once our Turkish guests leave. So its a symbolic exercise, boasting warm relations between the two countries.