With the following code on a very slow machine I'm still getting execution of the same message twice. The machine is a 233.

Add Message to queue
Set Timer Interval to 1 millisecond.
Enable Timer

** Added logging for debugging purposes.
** Function Timer
Has the Timer been disabled
  Return
Disable Timer

Log "In Timer"

Do while there are still messages in the queue
  Log "Process the first message"
  Process the first message

  Log "Are there more messages?"
  Are there more messages?
    Log "Remove the first message"
    Remove the first message