 The left hand shows each successive pair of values used as (x,y),
    & shows any serial correlations and missed values.
 Ideally EVERY point will fade up from black to red.
 Bad random generators will group results on lines....

 The other is a self-scaling histogram which shows 256 histogram
   'bins' and so shows any bias.
 Ideally, all bar lengths would be the same, long term.
 This self-scales as the count increases, and always shows the 
   previous distribution at the last scale-change.

 The texteditor shows updates on how well values are split above
   /below 0.5.

 The generators at present available are:-
    LB's own rnd( n)
    A mod-congruent generator ( try changing values!)
    A 'numerological' calculation.
    A switch-tail ring counter set for maximum length( change
       the values for fun!)
    RAND Corporation's table of physically generated true
       random numbers.
 I will be adding a 'square and select middle five digits' one.

 I recommend Wikipedia's relevant articles...
 Please note there are plenty of known bugs I've not yet bothered 
 to hunt down, but the random parts are fine! 
 Just don't expect to leave or change mid-run!