When most people get a bulls eye or star break in their windshield they figure they just have to wait for it to become a crack so the insurance company will file a claim. When you do this you will have to pay your deductible before the work is done. When you have your windshield repaired instead of replaced your full coverage insurance will pay 100% of the repair.
You can choose any facility you want to do the repair and they will contact the insurance company, help you file a glass only claim for repair only and it usually takes less than 30 minutes to do a repair and call in the claim. Repairing your windshield helps the environment by keeping glass out of landfills and you keep the factory windshield seal so there are no leaks. All repair companies that I know of give a lifetime warranty on repairs so you may never have to replace your windshield unless something actually cracks it bad enough.
Most insurance companies will allow repairs up to six inches in length. As long as the damage is not in the drivers direct view it can be repaired and is nearly invisible when done correctly. Look in your local phone book to find an auto glass service provider to help you with any questions you may have and they will gladly help you. You can even ask your insurance agent about it and he may be able to recommend a repair shop to you.
If you have any kind of small damage to your windshield you should have it repaired as soon as possible because road vibration or more rocks hitting the glass can cause a lot bigger problem and cost you a lot of money.