Usage: ON [#|+|-|^|&|@]EXEC_ERRORS [-|^]<parameters> [action]
  This is activate whenever an EXEC'd process produces output
  to its standard error channel.  The process number is the
  number assigned by EXEC to the process (see HELP EXEC).  The
  parameters to this function are:
    $0  The process number that activated the ON
	This may also use the process name.  (See ON EXEC)
    $1- The line of output to stderr
