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I could not find Window->Dynamic Help, nor could I access dynamic help window using Alt+F6 or Ctrl+F6 I am using VNC to test A11Y, and it could be related to keyboard mapping with Alt+F6 or Ctrl+F6. If Alt+F6 or Ctrl+F6 works on regular keboard mapping on a desktop, this is not a P1 bug.
The menu is in Help | Dynamic Help and the keyboard short cur is Ctrl+Alt+H and is working fine. Dynamic help is not part of CND and issues should be filed against ATD.