Random numbers and finding the seed

As is explained in TB's references, to generate a random number, we use the RND function. And to be sure that each run of RND does not return the same number, we use the statement RANDOMIZE.
The RANDOMIZE statement presumeably "seeds" the RND function with a new number so that RND returns a new random number with each run.
My question is: is it possible to determine the "seed" number? And if it is possible, how can we determine what the seed number is and how does RND use the seed number?
Can I input my own "seed" numbers? If so, how can I accomplish this?