Preventing direct access to pages

Thanks for the help on my previous problem.  Too long away
from DOS
made me rusty.  As usual, once you
know what to look for you can find it in help :-(

Next problem - I have some pages that I don't want users to
be able
to enter the url in their browser and be able to access
them, I only
want access from a link elsewhere in the web site.  Can
anyone please
give me a pointer/keyword etc so that I can find the
information.

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