; permanent loop with conditional exit
$Tag = 1
While $Tag     ; Loop forever while Tag is true
  ; do stuff here...
  If <EXIT CONDITION TEST>  ; if some condition exists where we should exit
    $Tag = 0
  EndIf
Loop

$Tag = 1
While $Tag     ; Loop forever while Tag is true
  ; do stuff here that should happen on every loop...
  If <EXIT CONDITION TEST>  ; if some condition exists where we should exit
    $Tag = 0
  EndIf
  ; do MORE stuff here that depends on the stuff earlier in the loop, but needs to not happen after the tag to exit the loop has been triggered.
Loop

$exitloop=true
? $exitloop
$exitloop=false
? $exitloop
$exitloop=foobar
? $exitloop

function true()
  $true=not 0
endfunction

function false()
  $false=not 1
endfunction

$Tag = 1
While $Tag
  ; always do this stuff...
  If <EXIT CONDITION TEST> ; put your test here!
    $Tag = 0
  Else
    ; do this stuff unless we've been terminated
  EndIf
Loop