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Technically, they are not. A computer does not understand the concept of picking a random number. Although, methods have been put in place to generate either true or pseudorandom numbers using algorythems or some sort of physical measurement.
Rolls on this site are indeed as random as a CPU can determine it and in no way are dice rolls manually manipulated. The rolling statistics page will show all of your room's rolls and the entire site's rolls. Even though the odds are very small, it is possible to have the same dice roll three straight times.
Here are a few articles on Computer Science and Random Numbers:
Not at this time. But if the demand is there, I can potentially basketball and hockey.
Your name is used throughout the site to distinguished you are logged in and any changes or actions are yours. Your e-mail will only be used for resetting your password or if I need to send out an update to all customers on website changes. Your information will not be sold to any third parties in anyway.
Not at all, nor is there a minimum. Donations are welcome as there are internal costs to maintaining the site.