HELP
The pins on objects affect the way that they 
operate, thereby affecting the execution 
flow of the model.  Here is a summary of the 
types of pins available on objects and what 
they do:

* Data pins input and output a container.
  An object will not operate until all of 
  its synchronous data input pins are 
  activated.  Note that the JCT object has
  asynchronous data inputs.

  After the object operates, the output 
  data pin(s) are activated.

* Control pins (optional) are asynchronous
  inputs that affect the state of the object
  but have no effect on the propagation.
  Common control pins include Clear, Reset,
  and Default Value.  Lines that connect to
  a control pin are dashed to show that
  their inputs do not affect propagation.

  * XEQ pins are asynchronous input pins
  that force the object to operate.  An XEQ
  pin must be used on Collector and Set
  Values to tell the object when you're done
  inputing data.

  You can add an XEQ input pin to a
  UserObject to force it to operate before
  the data and sequence input pins have been
  activated.  Adding an XEQ pin is rarely
  needed to have your model run correctly.


* Sequence pins are only used to specify the
  order of execution.  You generally don't
  have to use them.  An object only operates
  after all the synchronous data input pins
  and sequence input pins (if connected) are
  activated.  You cannot open a sequence
  pin; it does not have a terminal.  A
  sequence output pin activates after all
  the data output pins have activated and
  data flow has propagated as far as
  possible.

  Note that sequence input and XEQ pins are
  activated by the presence of a container.
  These pins ignore the data in the
  container.  A sequence output pin
  activates with an empty (nil) container.

* Error pins (optional) are output pins that
  trap any error condition that is generated
  by the object and outputs the associated
  error number.

  If an error occurs, the error pin is
  activated instead of any data output pins.
  Only the error pin and the sequence output
  pin (if connected) are activated.  

END HELP
