there is a installd icon in the setting->accessibility->privacy. it can be seen in the screenshot
Any ideas what it is for?
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I've had this question as well and finally went digging. This information is stored in the OS X Privacy database. This db can be accessed with the command-line tool
tccutil, but the only ("supported") option is reset. That is of course not very useful here. I found someone at this page who wrote a short python utility to edit this database. Examining the code, the db is located at
/Library/Application Support/com.apple.TCC/TCC.db (you will need sudo access for this). It is a SQLite db. There are entries in there for
/System/Library/PrivateFrameworks/PackageKit.framework/Resources/installd which is almost certainly the installd referenced in the preference pane. This is the daemon which occasionally checks for software updates. Since it is Apple code, I am inclined to trust it.