code:
$a=''
$rc=test1()
? 'a'=$a
? 'rc='+$rc
? ''+@ERROR+' - '+@SERROR
$rc=test2()
? 'a'=$a
? 'rc='+$rc
? ''+@ERROR+' - '+@SERROR
function test1($a)
  $test1=''
  if not $a
    return
  else
    ; stuff
  endif
endfunction
function test2($a)
  $test2=''
  if not $test2
    exit 87
  else
    ;stuff
  endif
endfunction
Difference:
The first function call does not set an appropriate rerror code whereas the second call rteturns an appropriate error code which canthen be tested for.
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There are two types of vessels, submarines and targets.