How do you program a new key on Honda Odyssey?

It all depends on the year. I have a 98 Accord and have found out that they can offer me a new Honda key for 15.00 and then you pay 80.00 to 100.00 to program it so your car can start with it. The dealer also offered me an after market key for 30.00 and then they read your original key's transponder and then clone it to the new key. The programmong of the key to the car other than cloning must be done with a Honda PGM tool or some other after market equivelant.
Anyone who tells you that you can do a procedure like playing with the door lock buttons or swapping keys rapidly means well but thay are wasting your time. good luck.