[BruinEric]

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I mean how can a program be truely random. Lets say it takes a seed for the RNG

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Why guess how Paradise uses entropy for their RNG when they explain it in detail on their website? You should read the whole thing to assuage your concerns about how your web-surfing habits might effect the shuffle in a way to make it not random.

Here is the bit on entropy collection for their RNG:

We have two main sources of these random bits. First, the rng on the server samples the low order bits of the CPU's time stamp counter (667MHz) at irregular parts of the program and when data is received from client connections, and uses it to add to the entropy in our large seed.

Secondly (and mainly) the client programs send their own 32-bits of entropy with every action they make and with several of the other packets they send to the server. The client's entropy is gathered from both mouse and keyboard movements, as well as the lower 32-bits of their CPU time stamp counters. With thousands of clients connected using all sorts of different hardware and moving their mice in different non-predictable ways, this is by far the biggest source of entropy and gets us far more than 17 new random bits per second. In fact, tests performed in February 2001 indicate that it typically yields over 7000 bits of new random data per second. We're using several sources of reliably random entropy; no single point of failure. Can you say overkill?

Let me add a little factiod I put on my blog from an interview with Dan Paymar -- those shuffling machines you see at the B&M? They use an RNG (gasp!).