Not sure what you mean by page. If you mean web page, the answer would be no.
If you mean a slide, the answer would also be no. If you mean a presentation
file, yes, you can do a couple of things depending on your version of
PowerPoint, but you didn't mention that either.
Password protect a presentation
http://www.rdpslides.com/pptfaq/FAQ00038.htm
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Sonia Coleman
Microsoft PowerPoint MVP Team
Autorun Software, Templates and Tutorials
http://www.soniacoleman.com