HELP
Propagation is the general flow of execution
through your model.  This propagation summary
describes the order in which objects operate:

* Data flows through objects from left to
  right, sequence flows from top to bottom.
* All data input pins must be connected.
* Start objects operate first.  Objects with
  no data or sequence input dependencies
  operate next.
* All synchronous data input pins must be
  activated before an object operates.
* If the sequence input pin is connected, it
  must be activated before an object can
  operate.
* Objects with synchronous data inputs
  operate only once unless connected to an
  iteration subthread or forced to operate by
  an XEQ pin.
* Control pins are asynchronous and do not
  affect the operation of the object.
* When an error is generated, the error pin
  is activated instead of the data output
  pins.  The sequence output pins are
  activated.
* Parallel subthreads, hosted by a single
  output pin, may operate in any order.
* Multiple threads operate simultaneously.
END HELP
