The purpose of the Exclusions category is to keep specific windows or sets of windows unprocessed by Actual Tools programs only when the Default Settings rule is enabled. This category generally includes system and other special-purpose windows that handle background tasks which are hidden from the user and do not involve user interaction. In other words, if you elect to enable the Default Settings rule this is a way of telling the Actual Tools program to process all windows except those itemized under the Exclusions category. You can add and delete as many Exclusion rules as you like, but you should exercise great caution deleting any of the Exclusion rules that are listed in this category by default as the program ships from Actual Tools, since improper deletion could result in system instability.
Hint You can disable a particular Exclusion rule to force the associated target window to conform to the Default Settings rule but you should exercise the same precautions as when deciding to delete an Exclusion rule.