When you enable DSLocalizator, in the System Installation and Host Options, you can enable the hacks and you also have an option Hack Reminder Status.

When you enable DSL, DSL will change 2 lines in the core files. When you upgrade DNN, your upgrade will overwrite the modified files and a "superuser" (a host account) has to re-enable the hack status. If you might forget, DSL offers the Hack Reminder Status.If you select "Installed, Enabled", DSL will start sending you emails to remind you to re-enable those hacks, every so many minutes. If you want to enable this, you should put the reminder task interval on 1440 minutes, which would be once a day? Unless the installation is mission-critical