I used to work with Subversion and a system tray tool (SVN Notifier) to monitor the repository so I would immediately see when my local copy was not up-to-date anymore, and I am wondering if some equivalent was available for Perforce (on Windows).
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If you use the Perforce GUI client, you can setup email notifications for as many folders as you like by going to:
This assumes the review daemon has already been setup on the server.
See http://public.perforce.com/wiki/Frequently_Asked_Questions#How_do_I_track_changes_to_a_project_I_am_interested_in.3F