Library /sys$common/syshlp/dbg$uihelp.hlb DEBUGUI, ha_window_contbutton  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  If you decide to examine events in the Memory Map as your application
  is executing, you can use the heap analyzer's push buttons to slow,
  pause, and otherwise affect the speed of the display.

  The Slow and Pause push buttons allow you to slow or pause the display.

  The Step push button allows you to single-step through memory events.

  The Sync histogram to the right of the Sync button indicates how far
  behind your application the heap analyzer is running.  For performance
  reasons, the heap analyzer displays memory events a few seconds after
  their occurrence in your application.

  The Sync push button allows you to synchronize heap analyzer display
  and application execution, if this is important to you.  Your
  application runs more slowly when you request synchronization.