If the app is for a customer, find out from the customer what size screens the majority of employees using Qlikview have, then base the Screen size on the Customers answer
The best option going forward in my opinion is to use 1024 x 768 this is the size of the iPad screen and the world is going mobile so.......
For Qlikview Apps it's better to keep the size of your dashboard to 980 x 610 so if you decide you want this available on the iPad you will have the best possible screen layout for it and you won't have to re arrange all your objects, but it is your choice
Hope that helps
Thanks for the information, can you able to say device type for each resolution, if possible?
Not for customer, learn about the resolution for referrence. Have a doubt why qlikview give this default resolution.Am sure any reason behind it.
1024 * 768 -> ipad
640 * 480 used for and others?