This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
You will have to give multiple params each with the same name and different value.
The precednce would be in the order you give them. In the above example, it would 026 and then 027
And if the original request originally contained a parameter called desgCode with a value of say '025', that too would be visible to the included/forwarded page and its precedence would be at the end (026, 027, 025).