Use the sliders in the Request Percent Confidence
  Levels area to specify the importance, for play
  synchronization, of specific X Requests sent by your
  application during script playback.  This feature is
  provided for advanced users of the X Play/Record tool.

  When scripts are recorded, the numbers of various X
  Requests seen are recorded in the script file.  These
  may be used during script playback to help synchronize
  the playback.  By default, the script will only
  continue after the same numbers of X Requests are
  detected during playback (or until timeout).  Changing
  the default confidence levels for particular X
  Requests, allows the script to continue after a
  percentage of the expected number of X Requests have
  been satisfied.