Which packages are not required?

Hi Friends,
Initially, I was trying to install arch by just installing base and then going ahead, but was unable to get X. Then, I installed base+X11+X11 libs+ X11 something (dont remember..) and after a lot of trouble, finally got XFCE installed and running (though still problems with fontsand have posted another query in desktop environment section). I have noticed that in doing so, I have installed a lot of things that are not required for my system, like xf86-input-bla bla and xf86-vide-bla bla, I know that only a few of them are required, but i'm afraid of uninstalling anything given that could break the system.
So, is there a way to determine which packages are being used by my system and which are required so that I can free up some space and make my box more slim.
Please post your opinions. Thanks in advance.
Ravi S Ghosh

FUBAR wrote:
[22:30:01|foo@bar:~] $ pacman -Q --help
usage: pacman {-Q --query} [options] [package]
options:
-e, --orphans list all packages that were explicitly installed
and are not required by any other packages
o_O
There are two notions of "orphan". As it is meant in the orphan script, a package is an orphan iff it is not needed in a working system. This is an intrinsically vague target, which can be focussed only through a partial heuristics.
In the sense of the -Qe pacman option, an app is an orphan iff it is not a dependency of another package. In this sense, many vital apps -- explicitly installed -- in a system are orphans.
However, it is true that pacman -Qe allows to have a list of the top-level apps (the stuff you know what it is, without the libraries etc.). If you identify in the list of pacman orphans the apps you do not need and then remove them with 'pacman -Rsc', you clean your system pretty well.
However, you should be careful, many problems can be foreseen when you do not know what it is the package you are removing.

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mpan wrote:
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