As identifiers are evaluated in every iteration, e.g.:
Code:
; /freeze <N in s>

alias freeze { 
  var %end = $calc($ticks + $$1 * 1000)
  while ($ticks < %end) { noop or code here }
}
Not that I can think of any use for it - apart from heating one's room with the CPU waste heat /freeze will cause... wink