& btlag()
 
  Syntax: btlag()
 
  This function will return a '1' if the MUX event scheduler is out of 
  sync (IE: Lagging), and a '0' if all is well. This is pretty much 
  useless on even a semi-quazi-modern machine.
 
  Example:
 
  > think btlag()
  0
  > think btlag()
  1