U0 RandPts()
{
  I64 i;
  F64 t0=tS;
  do {
    for (i=0;i<1024;i++) {
      gr.dc->color=RandU16&15;
      GrPlot(gr.dc,RandU32%GR_WIDTH,RandU32%GR_HEIGHT);
    }
    Yield;
  } while (tS-t0<1);
  DCFill;
}

U0 RandDemo()
{
  I64 i;

  "Seed(0) will do timer XORed random numbers.  "
        "A task starts with Seed(0) by dft.\n";
  PressAKey;
  Seed;
  RandPts;
  DCFill;

  "\nSeed(num) will do deterministic, non-timer random numbers starting at "
        "a specific seed.  You can run a specific video game over and over "
        "by typing Seed(num) at the cmd line before the game.\n";
  PressAKey;
  Seed(1);
  RandPts;
  DCFill;

  "\n\n\nWatch when we specify specific seeds:";

  "\n\nSeed(1);\n";
  Seed(1);
  for (i=0;i<5;i++)
    "%d: %d\n",i,RandI16;

  "\nSeed(2); Different, right?\n";
  Seed(2);
  for (i=0;i<5;i++)
    "%d: %d\n",i,RandI16;

  "\nSeed(1); Repeats earlier values.\n";
  Seed(1);
  for (i=0;i<5;i++)
    "%d: %d\n",i,RandI16;

  "\nSeed(0); Zero is special.\n";
  Seed(0);
  for (i=0;i<5;i++)
    "%d: %d\n",i,RandI16;

  "\nSeed(0); Non-repeating.\n";
  Seed(0);
  for (i=0;i<5;i++)
    "%d: %d\n",i,RandI16;

  Seed; //Dft should be kept to zero.
}

RandDemo;