Imported From: http://groups.google.com/group/in-portal-bugs/browse_thread/thread/e1231bea60aacbf9#
What is "CreatedBySystem" field in sections (which actually checks, that
ThemeId != 0) and what's difference between it and IsSystem field. For now
all pages, that are auto-created during theme scanning have IsSystem field
set to 1 and ThemeId > 0. When user creates virtual page, then it's always
has ThemeId = 0. Can't see the difference.
This is related to discussion about section protection against deletion,
since if we can figure out why we need that IsSystem field, then we can use
it to protect pages, not to invent one more yes/no type field.
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Best Regards,