This IBM Support document reviews how the IBM i Administration Runtime Expert provides an interface where you can compare end point IBM i systems to a central system to see the PTFs are missing. You then have the option to send, load and apply the missing PTFs to the end point systems.
Thie IBM Support page lists the technology refresh levels and related technology refresh group PTF level for the latest IBM i releases.
This IBM Support page is the main page from which you can go to specific PSP documents for various IBM i releases.
This IBM Support page has the latest information on IBM i group PTFs and recommended fixes.
In past articles about the Administration Runtime Expert, I mentioned that you install the ARE licensed program product on your central system, but I never documented steps on how you acquire the 5733-ARE program product.