Documentation for Confluence 5.7.
Documentation for Confluence Cloud and earlier versions of Confluence is available too.

Title: Watch Pages, Spaces and Blogs  
Author: Vidya Madabushi Aug 01, 2005
Last Changed by: Rachel Robins [Atlassian Technical Writer] Mar 16, 2015
Tiny Link: (useful for email) https://confluence.atlassian.com/x/OyEC
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