[lug] RH Linux update?

[David.Menges at UCHSC.edu]

A very newbie question:  I installed RH Linux via the install GUI and chose
a standard Server config (not custom), but it didn't load something I need.
So I got back into the install GUI and chose "Update".  Nothing is checked -
how do you know what the standard Server config has already installed?  I
think the answer is "use rpm with certain parameters", but it seems weird
the install GUI doesn't tell you...