See here, it's in this KB article:
pcAnywhere Automated Uninstall Procedures
Article:HOWTO65761 |
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Created: 2012-01-18 |
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Updated: 2012-02-01 |
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Article URL http://www.symantec.com/docs/HOWTO65761 |
pcA 12.5 = “msiexec /x {12518183-866A-11D3-97DF-0000F8D8F2E9} /qn”
https://www-secure.symantec.com/connect/forums/pcanywhere-guid-uninstall-string-many-versions#comment-2517131