Trickler (fsg.exe, fsg-ag.exe, fsg*.exe) Trickler is an "install stub", a small program that is installed with the application you really wanted. (Gator almost always appears on your system due to installing OTHER software, and not the installer available from Gator's website.) When installed, Trickler inserts a Run key in your Registry so that it is silently and automatically loaded every time you start your computer. Trickler runs hidden and very slowly downloads the rest of Gator/OfferCompanion onto your system. It is suggested that this "trickling" activity is intended to slip under the user's radar, the steady, low usage of bandwidth going unnoticed.