Here is an annoying bug in LabVIEW 7.0 with the help window, the window will unlock and change, even if it is locked.
1. open the help window (Cntrl+H)
2.From your main VI diagram, place any sub vi on the diagram.
3.Hover over any sub VI or primitive that has help defined, then lock the help window, so the help window now shows your help definintion and is locked.
4.Open the sub VI, the help window should still be locked on your help definition.
5. Close the sub VI front panel, the help window will unlock, and is blank

This works with LabVIEW 7.0 (win32 version) on any VI

I know this is not a big deal, but it is annoying. After all, if the help window doesn't lock when I tell it to, then what is the purpose of the lock?