In which TR or OS version came xxx

Gents and Ladies,

I am working at several partitions at several clients at the same time
where I am getting more and more concerned if I can use new features like
overload or *UTF8 support and so on.

Have any of you a cheat sheet I can use to check if I can use this or that
at the client?

I am not asking for that answer - "just upgrade the client to latest OS +
TR", but rather a decent conversation of code evolution over time and how
to manage back level - that is the real world I am facing.

This is not only RPG - it goes for the rest of IBM i. However Db2 have a
cool feature I am using over and over again that might help to some
inspiration:

select * from qsys2.services_info;

This is cool (Thanx Scott) and states which version of os it will run -
however not the TR....

Is there a cheat sheet out there for RPG ( base OS commands -etc) ?

What do we do ?

Thank You !!

Niels Liisberg