Kix does not have a built in true and false... This script may help explain it... give it a whirl to see the results... or change the words in your code to see it always resolve to true.

 Code:
$exitloop=true
? $exitloop
$exitloop=false
? $exitloop
$exitloop=foobar
? $exitloop


Basically anything you put there will make exitloop evaluate to "true".

The good news... it's easy to work around... just add these to your script and the true and false evaluate properly.

 Code:
function true()
  $true=not 0
endfunction

function false()
  $false=not 1
endfunction