This is something that is covered in forms of Mathematics and Physics.
A computer can not be totally random, because it follows a pattern that is laid out by a program. Although that pattern is so laid out that by the program in such away that the pattern it would produce would take so long to figure out that it is unfathoumable (is that a word). It would follow string which cannot be followed. I think is right, or at least it was when I done applied Mathematics.
The difference is you will never trust a computer, although its as random as dealing the cards yourself.
If you where playing live, and your oppo got dealt aa three times in a row, you would say you are so lucky, if it happened online you would say its fixed, the computer wants you to win.