I use this application via an automated daily job (CRON) and also at boot time (CRON) & login. Certainly any of these can be bypassed, but I only need one to execute successfully to get started relocating my missing PB. Likely, most thieves will at least boot into the OS once (my system is configured to auto boot into a guest account where the login item fires off) but some may not. Nothings perfect, but this is more about covering as many bases as possible. And, in this case, without paying for an off-the-shelf solution that suffers from the same limitations.
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While no solution is one hundred percent effective for ensuring the location (and subsequent return) of a stolen or misplaced computer system, the PBphoneHome application is a helpful tool that can be combined with other best practices (Open Firmware password protection, data encryption routines, data backups, etc.) to form an overall system protection strategy.