Thanks for the replies...
Lee:
I was surprised that ^/$ match begin/end of string, not just line, in the Find Symbol window. That is not how those characters behave in an edit buffer, or in the Find and Replace dialog.
...Unless 'line', in the Find Symbols window, means the line a symbol is listed on... Then ^POINT$ makes sense, since it is the only item on the line it is displayed on. (I was thinking in terms of the file where it is defined, where 'POINT' is neither the first nor last word on the line it appears on.)
Dennis:
From the Help:
<All Tag Files> - Select this setting to search all tag files for all languages.
I understand now, as explained above, that <Context Tagging> is related to current workspace/project.